66627904 has 28 divisors (see below), whose sum is σ = 151103584. Its totient is φ = 28554624.

The previous prime is 66627901. The next prime is 66627923. The reversal of 66627904 is 40972666.

It is a tau number, because it is divible by the number of its divisors (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66627901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73914 + ... + 74809.

Almost surely, 2^66627904 is an apocalyptic number.

66627904 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66627904 is an abundant number, since it is smaller than the sum of its proper divisors (84475680).

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

66627904 is a wasteful number, since it uses less digits than its factorization.

66627904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148742 (or 148732 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 66627904 is about 8162.5917452731. The cubic root of 66627904 is about 405.4015303458.

The spelling of 66627904 in words is "sixty-six million, six hundred twenty-seven thousand, nine hundred four".