642461216 has 24 divisors (see below), whose sum is σ = 1270531584. Its totient is φ = 319786560.

The previous prime is 642461173. The next prime is 642461219. The reversal of 642461216 is 612164246.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (642461219) 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, 37880 + ... + 52151.

It is an arithmetic number, because the mean of its divisors is an integer number (52938816).

Almost surely, 2^642461216 is an apocalyptic number.

It is an amenable number.

642461216 is a deficient number, since it is larger than the sum of its proper divisors (628070368).

642461216 is a wasteful number, since it uses less digits than its factorization.

642461216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90264 (or 90256 counting only the distinct ones).

The product of its digits is 13824, while the sum is 32.

The square root of 642461216 is about 25346.8186563916. The cubic root of 642461216 is about 862.8771565109.

The spelling of 642461216 in words is "six hundred forty-two million, four hundred sixty-one thousand, two hundred sixteen".