642928632 has 32 divisors (see below), whose sum is σ = 1609411200. Its totient is φ = 214030944.

The previous prime is 642928571. The next prime is 642928633. The reversal of 642928632 is 236829246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642928633) 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, 1869 + ... + 35907.

It is an arithmetic number, because the mean of its divisors is an integer number (50294100).

Almost surely, 2^642928632 is an apocalyptic number.

It is an amenable number.

642928632 is an abundant number, since it is smaller than the sum of its proper divisors (966482568).

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

642928632 is a wasteful number, since it uses less digits than its factorization.

642928632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34835 (or 34831 counting only the distinct ones).

The product of its digits is 248832, while the sum is 42.

The square root of 642928632 is about 25356.0373875730. The cubic root of 642928632 is about 863.0863648945.

The spelling of 642928632 in words is "six hundred forty-two million, nine hundred twenty-eight thousand, six hundred thirty-two".