27972798 has 16 divisors (see below), whose sum is σ = 63937920. Its totient is φ = 7992216.

The previous prime is 27972781. The next prime is 27972809. The reversal of 27972798 is 89727972.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 27972798.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 332968 + ... + 333051.

It is an arithmetic number, because the mean of its divisors is an integer number (3996120).

Almost surely, 2^27972798 is an apocalyptic number.

27972798 is an abundant number, since it is smaller than the sum of its proper divisors (35965122).

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

27972798 is a wasteful number, since it uses less digits than its factorization.

27972798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666031.

The product of its digits is 889056, while the sum is 51.

The square root of 27972798 is about 5288.9316501539. The cubic root of 27972798 is about 303.5605304534.

The spelling of 27972798 in words is "twenty-seven million, nine hundred seventy-two thousand, seven hundred ninety-eight".