642737948 has 12 divisors (see below), whose sum is σ = 1127049000. Its totient is φ = 320723952.

The previous prime is 642737939. The next prime is 642737951. The reversal of 642737948 is 849737246.

It is a super-2 number, since 2×642737948² = 826224139598501408, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 642737896 and 642737905.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159011 + ... + 163002.

It is an arithmetic number, because the mean of its divisors is an integer number (93920750).

Almost surely, 2^642737948 is an apocalyptic number.

It is an amenable number.

642737948 is a deficient number, since it is larger than the sum of its proper divisors (484311052).

642737948 is a wasteful number, since it uses less digits than its factorization.

642737948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322516 (or 322514 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 50.

The square root of 642737948 is about 25352.2769786069. The cubic root of 642737948 is about 863.0010298483.

The spelling of 642737948 in words is "six hundred forty-two million, seven hundred thirty-seven thousand, nine hundred forty-eight".