215783040 has 256 divisors, whose sum is σ = 795795840. Its totient is φ = 49152000.

The previous prime is 215783039. The next prime is 215783059. The reversal of 215783040 is 40387512.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 215782989 and 215783007.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 358740 + ... + 359340.

Almost surely, 2^215783040 is an apocalyptic number.

215783040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215783040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (397897920).

215783040 is an abundant number, since it is smaller than the sum of its proper divisors (580012800).

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

215783040 is a wasteful number, since it uses less digits than its factorization.

215783040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651 (or 639 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 215783040 is about 14689.5554731925. Note that the first 3 decimals coincide. The cubic root of 215783040 is about 599.7990438130.

The spelling of 215783040 in words is "two hundred fifteen million, seven hundred eighty-three thousand, forty".