642573040 has 20 divisors (see below), whose sum is σ = 1493982504. Its totient is φ = 257029184.

The previous prime is 642572999. The next prime is 642573047. The reversal of 642573040 is 40375246.

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

It is a super-2 number, since 2×642573040² = 825800223469683200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 642572993 and 642573011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642573047) 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, 4016002 + ... + 4016161.

Almost surely, 2^642573040 is an apocalyptic number.

It is an amenable number.

642573040 is an abundant number, since it is smaller than the sum of its proper divisors (851409464).

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

642573040 is a wasteful number, since it uses less digits than its factorization.

642573040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8032176 (or 8032170 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 31.

The square root of 642573040 is about 25349.0244388221. The cubic root of 642573040 is about 862.9272164861.

The spelling of 642573040 in words is "six hundred forty-two million, five hundred seventy-three thousand, forty".