642928709880 has 96 divisors (see below), whose sum is σ = 2166907906800. Its totient is φ = 171447653376.

The previous prime is 642928709803. The next prime is 642928709881. The reversal of 642928709880 is 88907829246.

It is a super-2 number, since 2×642928709880² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642928709881) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33062745 + ... + 33082184.

Almost surely, 2^642928709880 is an apocalyptic number.

642928709880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

642928709880 is an abundant number, since it is smaller than the sum of its proper divisors (1523979196920).

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

642928709880 is a wasteful number, since it uses less digits than its factorization.

642928709880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66144955 (or 66144939 counting only the distinct ones).

The product of its (nonzero) digits is 27869184, while the sum is 63.

The spelling of 642928709880 in words is "six hundred forty-two billion, nine hundred twenty-eight million, seven hundred nine thousand, eight hundred eighty".