646220460 has 48 divisors (see below), whose sum is σ = 1810884096. Its totient is φ = 172185792.

The previous prime is 646220459. The next prime is 646220501. The reversal of 646220460 is 64022646.

It is a super-2 number, since 2×646220460² = 835201765845223200, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85599 + ... + 92841.

It is an arithmetic number, because the mean of its divisors is an integer number (37726752).

Almost surely, 2^646220460 is an apocalyptic number.

646220460 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

646220460 is an abundant number, since it is smaller than the sum of its proper divisors (1164663636).

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

646220460 is a wasteful number, since it uses less digits than its factorization.

646220460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8742 (or 8740 counting only the distinct ones).

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

The square root of 646220460 is about 25420.8666256680. The cubic root of 646220460 is about 864.5568737258.

The spelling of 646220460 in words is "six hundred forty-six million, two hundred twenty thousand, four hundred sixty".