66820828 has 12 divisors (see below), whose sum is σ = 117351640. Its totient is φ = 33291792.

The previous prime is 66820811. The next prime is 66820847. The reversal of 66820828 is 82802866.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28383 + ... + 30646.

Almost surely, 2^66820828 is an apocalyptic number.

It is an amenable number.

66820828 is a deficient number, since it is larger than the sum of its proper divisors (50530812).

66820828 is a wasteful number, since it uses less digits than its factorization.

66820828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59316 (or 59314 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 66820828 is about 8174.4007731454. The cubic root of 66820828 is about 405.7924392238.

The spelling of 66820828 in words is "sixty-six million, eight hundred twenty thousand, eight hundred twenty-eight".