645535152 has 120 divisors (see below), whose sum is σ = 1964847456. Its totient is φ = 197019648.

The previous prime is 645535147. The next prime is 645535153. The reversal of 645535152 is 251535546.

645535152 is a `hidden beast` number, since 6 + 4 + 553 + 51 + 52 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (645535153) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87013 + ... + 94139.

Almost surely, 2^645535152 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645535152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (982423728).

645535152 is an abundant number, since it is smaller than the sum of its proper divisors (1319312304).

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

645535152 is a wasteful number, since it uses less digits than its factorization.

645535152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7195 (or 7186 counting only the distinct ones).

The product of its digits is 90000, while the sum is 36.

The square root of 645535152 is about 25407.3838086490. The cubic root of 645535152 is about 864.2511486965.

The spelling of 645535152 in words is "six hundred forty-five million, five hundred thirty-five thousand, one hundred fifty-two".