642252764 has 6 divisors (see below), whose sum is σ = 1123942344. Its totient is φ = 321126380.

The previous prime is 642252703. The next prime is 642252817. The reversal of 642252764 is 467252246.

It is a happy number.

It is a super-2 number, since 2×642252764² = 824977225731279392, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80281592 + ... + 80281599.

It is an arithmetic number, because the mean of its divisors is an integer number (187323724).

Almost surely, 2^642252764 is an apocalyptic number.

It is an amenable number.

642252764 is a deficient number, since it is larger than the sum of its proper divisors (481689580).

642252764 is a wasteful number, since it uses less digits than its factorization.

642252764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160563195 (or 160563193 counting only the distinct ones).

The product of its digits is 161280, while the sum is 38.

The square root of 642252764 is about 25342.7063274623. The cubic root of 642252764 is about 862.7838238078.

The spelling of 642252764 in words is "six hundred forty-two million, two hundred fifty-two thousand, seven hundred sixty-four".