642579279 has 8 divisors (see below), whose sum is σ = 859822512. Its totient is φ = 426861120.

The previous prime is 642579269. The next prime is 642579281. The reversal of 642579279 is 972975246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 642579279 - 2⁵ = 642579247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642579239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 380284 + ... + 381969.

It is an arithmetic number, because the mean of its divisors is an integer number (107477814).

Almost surely, 2^642579279 is an apocalyptic number.

642579279 is a deficient number, since it is larger than the sum of its proper divisors (217243233).

642579279 is a wasteful number, since it uses less digits than its factorization.

642579279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762537.

The product of its digits is 1905120, while the sum is 51.

The square root of 642579279 is about 25349.1475004585. The cubic root of 642579279 is about 862.9300093128.

It can be divided in two parts, 64257 and 9279, that added together give a triangular number (73536 = T₃₈₃).

The spelling of 642579279 in words is "six hundred forty-two million, five hundred seventy-nine thousand, two hundred seventy-nine".