642475392 has 128 divisors (see below), whose sum is σ = 1850688000. Its totient is φ = 196306944.

The previous prime is 642475387. The next prime is 642475439. The reversal of 642475392 is 293574246.

It is a tau number, because it is divible by the number of its divisors (128).

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, 893209 + ... + 893927.

It is an arithmetic number, because the mean of its divisors is an integer number (14458500).

Almost surely, 2^642475392 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642475392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (925344000).

642475392 is an abundant number, since it is smaller than the sum of its proper divisors (1208212608).

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

642475392 is a wasteful number, since it uses less digits than its factorization.

642475392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928 (or 916 counting only the distinct ones).

The product of its digits is 362880, while the sum is 42.

The square root of 642475392 is about 25347.0982954657. The cubic root of 642475392 is about 862.8835029675.

The spelling of 642475392 in words is "six hundred forty-two million, four hundred seventy-five thousand, three hundred ninety-two".