642565020 has 48 divisors (see below), whose sum is σ = 1806392448. Its totient is φ = 170664000.

The previous prime is 642564983. The next prime is 642565037. The reversal of 642565020 is 20565246.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6274 + ... + 36393.

It is an arithmetic number, because the mean of its divisors is an integer number (37633176).

Almost surely, 2^642565020 is an apocalyptic number.

642565020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

642565020 is an abundant number, since it is smaller than the sum of its proper divisors (1163827428).

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

642565020 is a wasteful number, since it uses less digits than its factorization.

642565020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42930 (or 42928 counting only the distinct ones).

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

The square root of 642565020 is about 25348.8662468364. The cubic root of 642565020 is about 862.9236263857.

The spelling of 642565020 in words is "six hundred forty-two million, five hundred sixty-five thousand, twenty".