642252765 has 64 divisors (see below), whose sum is σ = 1285005312. Its totient is φ = 266112000.

The previous prime is 642252703. The next prime is 642252817. The reversal of 642252765 is 567252246.

It is not a de Polignac number, because 642252765 - 2¹⁴ = 642236381 is a prime.

It is a super-2 number, since 2×642252765² = 824977228300290450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 534165 + ... + 535365.

It is an arithmetic number, because the mean of its divisors is an integer number (20078208).

Almost surely, 2^642252765 is an apocalyptic number.

It is an amenable number.

642252765 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

642252765 is a wasteful number, since it uses less digits than its factorization.

642252765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1690.

The product of its digits is 201600, while the sum is 39.

The square root of 642252765 is about 25342.7063471919. The cubic root of 642252765 is about 862.7838242556.

The spelling of 642252765 in words is "six hundred forty-two million, two hundred fifty-two thousand, seven hundred sixty-five".