27720972 has 18 divisors (see below), whose sum is σ = 70072548. Its totient is φ = 9240312.

The previous prime is 27720967. The next prime is 27720983. The reversal of 27720972 is 27902772.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 770027 = 27720972 / (2 + 7 + 7 + 2 + 0 + 9 + 7 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 384978 + ... + 385049.

Almost surely, 2^27720972 is an apocalyptic number.

It is an amenable number.

27720972 is an abundant number, since it is smaller than the sum of its proper divisors (42351576).

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

27720972 is a wasteful number, since it uses less digits than its factorization.

27720972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770037 (or 770032 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 36.

The square root of 27720972 is about 5265.0709396930. The cubic root of 27720972 is about 302.6468453536.

The spelling of 27720972 in words is "twenty-seven million, seven hundred twenty thousand, nine hundred seventy-two".