642696598 has 4 divisors (see below), whose sum is σ = 964044900. Its totient is φ = 321348298.

The previous prime is 642696589. The next prime is 642696647. The reversal of 642696598 is 895696246.

It is a happy number.

642696598 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 is a super-4 number, since 4×642696598⁴ (a number of 36 digits) contains 4444 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, 160674148 + ... + 160674151.

It is an arithmetic number, because the mean of its divisors is an integer number (241011225).

Almost surely, 2^642696598 is an apocalyptic number.

642696598 is a deficient number, since it is larger than the sum of its proper divisors (321348302).

642696598 is a wasteful number, since it uses less digits than its factorization.

642696598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321348301.

The product of its digits is 5598720, while the sum is 55.

The square root of 642696598 is about 25351.4614568865. The cubic root of 642696598 is about 862.9825226386.

The spelling of 642696598 in words is "six hundred forty-two million, six hundred ninety-six thousand, five hundred ninety-eight".