72678866 has 16 divisors (see below), whose sum is σ = 119060928. Its totient is φ = 33070800.

The previous prime is 72678863. The next prime is 72678869. The reversal of 72678866 is 66887627.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (72678863) and next prime (72678869).

It is not an unprimeable number, because it can be changed into a prime (72678863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17840 + ... + 21531.

It is an arithmetic number, because the mean of its divisors is an integer number (7441308).

Almost surely, 2^72678866 is an apocalyptic number.

72678866 is a deficient number, since it is larger than the sum of its proper divisors (46382062).

72678866 is a wasteful number, since it uses less digits than its factorization.

72678866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39457.

The product of its digits is 1354752, while the sum is 50.

The square root of 72678866 is about 8525.1900858573. The cubic root of 72678866 is about 417.3201749864.

The spelling of 72678866 in words is "seventy-two million, six hundred seventy-eight thousand, eight hundred sixty-six".