645151020 has 48 divisors (see below), whose sum is σ = 1912686048. Its totient is φ = 161920000.

The previous prime is 645151007. The next prime is 645151021. The reversal of 645151020 is 20151546.

It is not an unprimeable number, because it can be changed into a prime (645151021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 315231 + ... + 317270.

It is an arithmetic number, because the mean of its divisors is an integer number (39847626).

Almost surely, 2^645151020 is an apocalyptic number.

645151020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645151020 is an abundant number, since it is smaller than the sum of its proper divisors (1267535028).

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

645151020 is a wasteful number, since it uses less digits than its factorization.

645151020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632530 (or 632528 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 645151020 is about 25399.8232277313. The cubic root of 645151020 is about 864.0796876518.

The spelling of 645151020 in words is "six hundred forty-five million, one hundred fifty-one thousand, twenty".