642490 has 16 divisors (see below), whose sum is σ = 1181952. Its totient is φ = 251344.

The previous prime is 642487. The next prime is 642517. The reversal of 642490 is 94246.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214 + ... + 1153.

It is an arithmetic number, because the mean of its divisors is an integer number (73872).

2⁶⁴²⁴⁹⁰ is an apocalyptic number.

642490 is a deficient number, since it is larger than the sum of its proper divisors (539462).

642490 is a wasteful number, since it uses less digits than its factorization.

642490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1421.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 642490 is about 801.5547392412. The cubic root of 642490 is about 86.2890042729.

The spelling of 642490 in words is "six hundred forty-two thousand, four hundred ninety".