2017497640 has 32 divisors (see below), whose sum is σ = 4541339880. Its totient is φ = 806648832.

The previous prime is 2017497617. The next prime is 2017497649. The reversal of 2017497640 is 467947102.

It can be written as a sum of positive squares in 4 ways, for example, as 2007219204 + 10278436 = 44802^2 + 3206^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 2017497593 and 2017497602.

It is not an unprimeable number, because it can be changed into a prime (2017497649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95044 + ... + 114316.

Almost surely, 2^2017497640 is an apocalyptic number.

2017497640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2017497640 is an abundant number, since it is smaller than the sum of its proper divisors (2523842240).

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

2017497640 is a wasteful number, since it uses less digits than its factorization.

2017497640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21901 (or 21897 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 2017497640 is about 44916.5630920265. The cubic root of 2017497640 is about 1263.5846606459.

The spelling of 2017497640 in words is "two billion, seventeen million, four hundred ninety-seven thousand, six hundred forty".