642697488 has 30 divisors (see below), whose sum is σ = 1798660734. Its totient is φ = 214232448.

The previous prime is 642697423. The next prime is 642697493. The reversal of 642697488 is 884796246.

It can be written as a sum of positive squares in only one way, i.e., 348643584 + 294053904 = 18672^2 + 17148^2 .

It is a super-2 number, since 2×642697488² = 826120122163020288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2231445 + ... + 2231732.

Almost surely, 2^642697488 is an apocalyptic number.

It is an amenable number.

642697488 is an abundant number, since it is smaller than the sum of its proper divisors (1155963246).

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

642697488 is a wasteful number, since it uses less digits than its factorization.

642697488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4463191 (or 4463182 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 54.

The square root of 642697488 is about 25351.4790101091. The cubic root of 642697488 is about 862.9829209884.

The spelling of 642697488 in words is "six hundred forty-two million, six hundred ninety-seven thousand, four hundred eighty-eight".