66976830 has 24 divisors (see below), whose sum is σ = 174139992. Its totient is φ = 17860464.

The previous prime is 66976829. The next prime is 66976849. The reversal of 66976830 is 3867966.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 372004 + ... + 372183.

It is an arithmetic number, because the mean of its divisors is an integer number (7255833).

Almost surely, 2^66976830 is an apocalyptic number.

66976830 is an abundant number, since it is smaller than the sum of its proper divisors (107163162).

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

66976830 is a wasteful number, since it uses less digits than its factorization.

66976830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744200 (or 744197 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 66976830 is about 8183.9373164755. The cubic root of 66976830 is about 406.1079857065.

The spelling of 66976830 in words is "sixty-six million, nine hundred seventy-six thousand, eight hundred thirty".