646022460 has 24 divisors (see below), whose sum is σ = 1808863056. Its totient is φ = 172272640.

The previous prime is 646022407. The next prime is 646022483. The reversal of 646022460 is 64220646.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

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, 5383461 + ... + 5383580.

It is an arithmetic number, because the mean of its divisors is an integer number (75369294).

Almost surely, 2^646022460 is an apocalyptic number.

646022460 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

646022460 is an abundant number, since it is smaller than the sum of its proper divisors (1162840596).

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

646022460 is a wasteful number, since it uses less digits than its factorization.

646022460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10767053 (or 10767051 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 646022460 is about 25416.9718888777. The cubic root of 646022460 is about 864.4685654998.

It can be divided in two parts, 6460 and 22460, that added together give a triangular number (28920 = T₂₄₀).

The spelling of 646022460 in words is "six hundred forty-six million, twenty-two thousand, four hundred sixty".