645062520 has 32 divisors (see below), whose sum is σ = 1935187920. Its totient is φ = 172016640.

The previous prime is 645062519. The next prime is 645062527. The reversal of 645062520 is 25260546.

It is a super-2 number, since 2×645062520² = 832211309417500800, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645062527) 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, 2687641 + ... + 2687880.

Almost surely, 2^645062520 is an apocalyptic number.

645062520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645062520 is an abundant number, since it is smaller than the sum of its proper divisors (1290125400).

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

645062520 is a wasteful number, since it uses less digits than its factorization.

645062520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5375535 (or 5375531 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 645062520 is about 25398.0810298731. The cubic root of 645062520 is about 864.0401751723.

The spelling of 645062520 in words is "six hundred forty-five million, sixty-two thousand, five hundred twenty".