642874 has 8 divisors (see below), whose sum is σ = 972288. Its totient is φ = 318780.

The previous prime is 642871. The next prime is 642877. The reversal of 642874 is 478246.

It is an interprime number because it is at equal distance from previous prime (642871) and next prime (642877).

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

It is not an unprimeable number, because it can be changed into a prime (642871) 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, 1012 + ... + 1519.

It is an arithmetic number, because the mean of its divisors is an integer number (121536).

2⁶⁴²⁸⁷⁴ is an apocalyptic number.

642874 is a deficient number, since it is larger than the sum of its proper divisors (329414).

642874 is a wasteful number, since it uses less digits than its factorization.

642874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2660.

The product of its digits is 10752, while the sum is 31.

The square root of 642874 is about 801.7942379439. The cubic root of 642874 is about 86.3061917666.

The spelling of 642874 in words is "six hundred forty-two thousand, eight hundred seventy-four".