80640972 has 18 divisors (see below), whose sum is σ = 203842548. Its totient is φ = 26880312.

The previous prime is 80640971. The next prime is 80640977. The reversal of 80640972 is 27904608.

80640972 is a `hidden beast` number, since 8 + 0 + 640 + 9 + 7 + 2 = 666.

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: 2240027 = 80640972 / (8 + 0 + 6 + 4 + 0 + 9 + 7 + 2).

It is not an unprimeable number, because it can be changed into a prime (80640971) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1119978 + ... + 1120049.

It is an arithmetic number, because the mean of its divisors is an integer number (11324586).

Almost surely, 2^80640972 is an apocalyptic number.

It is an amenable number.

80640972 is an abundant number, since it is smaller than the sum of its proper divisors (123201576).

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

80640972 is a wasteful number, since it uses less digits than its factorization.

80640972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2240037 (or 2240032 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 80640972 is about 8980.0318484959. The cubic root of 80640972 is about 432.0346551417.

The spelling of 80640972 in words is "eighty million, six hundred forty thousand, nine hundred seventy-two".