3654521640 has 192 divisors, whose sum is σ = 14808044160. Its totient is φ = 759375360.

The previous prime is 3654521581. The next prime is 3654521669. The reversal of 3654521640 is 461254563.

3654521640 is a `hidden beast` number, since 3 + 6 + 5 + 4 + 5 + 2 + 1 + 640 = 666.

3654521640 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 3654521595 and 3654521604.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 38199 + ... + 93638.

It is an arithmetic number, because the mean of its divisors is an integer number (77125230).

Almost surely, 2^3654521640 is an apocalyptic number.

3654521640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3654521640 is an abundant number, since it is smaller than the sum of its proper divisors (11153522520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3654521640 is a wasteful number, since it uses less digits than its factorization.

3654521640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131872 (or 131865 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The square root of 3654521640 is about 60452.6396446011. The cubic root of 3654521640 is about 1540.3172506570.

It can be divided in two parts, 36545 and 21640, that added together give a palindrome (58185).

The spelling of 3654521640 in words is "three billion, six hundred fifty-four million, five hundred twenty-one thousand, six hundred forty".