642579280 has 40 divisors (see below), whose sum is σ = 1707426432. Its totient is φ = 220312704.

The previous prime is 642579269. The next prime is 642579281. The reversal of 642579280 is 82975246.

642579280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642579281) 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, 573172 + ... + 574291.

Almost surely, 2^642579280 is an apocalyptic number.

It is an amenable number.

642579280 is an abundant number, since it is smaller than the sum of its proper divisors (1064847152).

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

642579280 is a wasteful number, since it uses less digits than its factorization.

642579280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1147483 (or 1147477 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 642579280 is about 25349.1475201830. The cubic root of 642579280 is about 862.9300097604.

It can be divided in two parts, 64257 and 9280, that added together give a palindrome (73537).

The spelling of 642579280 in words is "six hundred forty-two million, five hundred seventy-nine thousand, two hundred eighty".