652626640 has 20 divisors (see below), whose sum is σ = 1517357124. Its totient is φ = 261050624.

The previous prime is 652626613. The next prime is 652626647. The reversal of 652626640 is 46626256.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 157653136 + 494973504 = 12556^2 + 22248^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 652626640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (652626647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4078837 + ... + 4078996.

Almost surely, 2^652626640 is an apocalyptic number.

It is an amenable number.

652626640 is an abundant number, since it is smaller than the sum of its proper divisors (864730484).

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

652626640 is a wasteful number, since it uses less digits than its factorization.

652626640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8157846 (or 8157840 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 652626640 is about 25546.5582809113. The cubic root of 652626640 is about 867.4043567925.

The spelling of 652626640 in words is "six hundred fifty-two million, six hundred twenty-six thousand, six hundred forty".