642976 has 24 divisors (see below), whose sum is σ = 1288224. Its totient is φ = 315840.

The previous prime is 642973. The next prime is 642977. The reversal of 642976 is 679246.

642976 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

642976 is an admirable number.

It is a d-powerful number, because it can be written as 6⁷ + 4⁸ + 9³ + 2⁵ + 7⁵ + 6⁷ .

It is not an unprimeable number, because it can be changed into a prime (642973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2131 + ... + 2413.

It is an arithmetic number, because the mean of its divisors is an integer number (53676).

2⁶⁴²⁹⁷⁶ is an apocalyptic number.

It is an amenable number.

642976 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

642976 is a wasteful number, since it uses less digits than its factorization.

642976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364 (or 356 counting only the distinct ones).

The product of its digits is 18144, while the sum is 34.

The square root of 642976 is about 801.8578427627. The cubic root of 642976 is about 86.3107560441.

The spelling of 642976 in words is "six hundred forty-two thousand, nine hundred seventy-six".