72287978 has 16 divisors (see below), whose sum is σ = 131212224. Its totient is φ = 29158080.

The previous prime is 72287977. The next prime is 72287983. The reversal of 72287978 is 87978227.

It is not an unprimeable number, because it can be changed into a prime (72287977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151628 + ... + 152103.

It is an arithmetic number, because the mean of its divisors is an integer number (8200764).

Almost surely, 2^72287978 is an apocalyptic number.

72287978 is a deficient number, since it is larger than the sum of its proper divisors (58924246).

72287978 is a wasteful number, since it uses less digits than its factorization.

72287978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303757.

The product of its digits is 790272, while the sum is 50.

The square root of 72287978 is about 8502.2337065033. The cubic root of 72287978 is about 416.5706734242.

The spelling of 72287978 in words is "seventy-two million, two hundred eighty-seven thousand, nine hundred seventy-eight".