66672906 has 32 divisors (see below), whose sum is σ = 141239808. Its totient is φ = 20937840.

The previous prime is 66672899. The next prime is 66672923. The reversal of 66672906 is 60927666.

It is a Curzon 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, 5641 + ... + 12851.

It is an arithmetic number, because the mean of its divisors is an integer number (4413744).

Almost surely, 2^66672906 is an apocalyptic number.

66672906 is an abundant number, since it is smaller than the sum of its proper divisors (74566902).

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

66672906 is a wasteful number, since it uses less digits than its factorization.

66672906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7306.

The product of its (nonzero) digits is 163296, while the sum is 42.

The square root of 66672906 is about 8165.3478799130. The cubic root of 66672906 is about 405.4927822722.

The spelling of 66672906 in words is "sixty-six million, six hundred seventy-two thousand, nine hundred six".