642604947 has 16 divisors (see below), whose sum is σ = 954956160. Its totient is φ = 381981312.

The previous prime is 642604933. The next prime is 642604951. The reversal of 642604947 is 749406246.

It is not a de Polignac number, because 642604947 - 2¹⁵ = 642572179 is a prime.

It is a super-2 number, since 2×642604947² = 825882235817745618, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 642604899 and 642604908.

It is not an unprimeable number, because it can be changed into a prime (642604967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 330613 + ... + 332550.

It is an arithmetic number, because the mean of its divisors is an integer number (59684760).

Almost surely, 2^642604947 is an apocalyptic number.

642604947 is a deficient number, since it is larger than the sum of its proper divisors (312351213).

642604947 is a wasteful number, since it uses less digits than its factorization.

642604947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663202.

The product of its (nonzero) digits is 290304, while the sum is 42.

The square root of 642604947 is about 25349.6537846180. The cubic root of 642604947 is about 862.9414991493.

The spelling of 642604947 in words is "six hundred forty-two million, six hundred four thousand, nine hundred forty-seven".