66667320 has 64 divisors (see below), whose sum is σ = 222228000. Its totient is φ = 17777664.

The previous prime is 66667309. The next prime is 66667331. The reversal of 66667320 is 2376666.

It is an interprime number because it is at equal distance from previous prime (66667309) and next prime (66667331).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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, 29785 + ... + 31944.

Almost surely, 2^66667320 is an apocalyptic number.

66667320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66667320 is an abundant number, since it is smaller than the sum of its proper divisors (155560680).

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

66667320 is a wasteful number, since it uses less digits than its factorization.

66667320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61749 (or 61739 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 36.

The square root of 66667320 is about 8165.0058175117. The cubic root of 66667320 is about 405.4814576023.

The spelling of 66667320 in words is "sixty-six million, six hundred sixty-seven thousand, three hundred twenty".