66902638 has 8 divisors (see below), whose sum is σ = 109477080. Its totient is φ = 30410280.

The previous prime is 66902609. The next prime is 66902657. The reversal of 66902638 is 83620966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 66902638.

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, 1520493 + ... + 1520536.

It is an arithmetic number, because the mean of its divisors is an integer number (13684635).

Almost surely, 2^66902638 is an apocalyptic number.

66902638 is a deficient number, since it is larger than the sum of its proper divisors (42574442).

66902638 is a wasteful number, since it uses less digits than its factorization.

66902638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3041042.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 66902638 is about 8179.4032789685. The cubic root of 66902638 is about 405.9579781304.

The spelling of 66902638 in words is "sixty-six million, nine hundred two thousand, six hundred thirty-eight".