66620460 has 48 divisors (see below), whose sum is σ = 196358400. Its totient is φ = 16830144.

The previous prime is 66620431. The next prime is 66620471. The reversal of 66620460 is 6402666.

66620460 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66620460² = 8876571381223200, 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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28080 + ... + 30359.

It is an arithmetic number, because the mean of its divisors is an integer number (4090800).

Almost surely, 2^66620460 is an apocalyptic number.

66620460 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66620460 is an abundant number, since it is smaller than the sum of its proper divisors (129737940).

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

66620460 is a wasteful number, since it uses less digits than its factorization.

66620460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58470 (or 58468 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 66620460 is about 8162.1357499125. The cubic root of 66620460 is about 405.3864319601.

The spelling of 66620460 in words is "sixty-six million, six hundred twenty thousand, four hundred sixty".