642249694 has 4 divisors (see below), whose sum is σ = 963374544. Its totient is φ = 321124846.

The previous prime is 642249679. The next prime is 642249709. The reversal of 642249694 is 496942246.

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

It is an interprime number because it is at equal distance from previous prime (642249679) and next prime (642249709).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160562422 + ... + 160562425.

It is an arithmetic number, because the mean of its divisors is an integer number (240843636).

Almost surely, 2^642249694 is an apocalyptic number.

642249694 is a deficient number, since it is larger than the sum of its proper divisors (321124850).

642249694 is a wasteful number, since it uses less digits than its factorization.

642249694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321124849.

The product of its digits is 746496, while the sum is 46.

The square root of 642249694 is about 25342.6457576947. The cubic root of 642249694 is about 862.7824490892.

The spelling of 642249694 in words is "six hundred forty-two million, two hundred forty-nine thousand, six hundred ninety-four".