66904994 has 32 divisors (see below), whose sum is σ = 110812800. Its totient is φ = 30108672.

The previous prime is 66904993. The next prime is 66905029. The reversal of 66904994 is 49940966.

66904994 = 7² + 8² + ... + 585².

It is not an unprimeable number, because it can be changed into a prime (66904993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 336107 + ... + 336305.

It is an arithmetic number, because the mean of its divisors is an integer number (3462900).

Almost surely, 2^66904994 is an apocalyptic number.

66904994 is a deficient number, since it is larger than the sum of its proper divisors (43907806).

66904994 is a wasteful number, since it uses less digits than its factorization.

66904994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474.

The product of its (nonzero) digits is 419904, while the sum is 47.

The square root of 66904994 is about 8179.5472979866. The cubic root of 66904994 is about 405.9627433922.

The spelling of 66904994 in words is "sixty-six million, nine hundred four thousand, nine hundred ninety-four".