642691498 has 4 divisors (see below), whose sum is σ = 964037250. Its totient is φ = 321345748.

The previous prime is 642691463. The next prime is 642691519. The reversal of 642691498 is 894196246.

642691498 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 603340969 + 39350529 = 24563^2 + 6273^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160672873 + ... + 160672876.

Almost surely, 2^642691498 is an apocalyptic number.

642691498 is a deficient number, since it is larger than the sum of its proper divisors (321345752).

642691498 is a wasteful number, since it uses less digits than its factorization.

642691498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321345751.

The product of its digits is 746496, while the sum is 49.

The square root of 642691498 is about 25351.3608707698. The cubic root of 642691498 is about 862.9802399532.

The spelling of 642691498 in words is "six hundred forty-two million, six hundred ninety-one thousand, four hundred ninety-eight".