78373728 has 36 divisors (see below), whose sum is σ = 222876108. Its totient is φ = 26124480.

The previous prime is 78373721. The next prime is 78373739. The reversal of 78373728 is 82737387.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×78373728² = 12284882481235968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78373721) 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 5 ways as a sum of consecutive naturals, for example, 135778 + ... + 136353.

It is an arithmetic number, because the mean of its divisors is an integer number (6191003).

Almost surely, 2^78373728 is an apocalyptic number.

It is an amenable number.

78373728 is an abundant number, since it is smaller than the sum of its proper divisors (144502380).

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

78373728 is a wasteful number, since it uses less digits than its factorization.

78373728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272147 (or 272136 counting only the distinct ones).

The product of its digits is 395136, while the sum is 45.

The square root of 78373728 is about 8852.8937641881. The cubic root of 78373728 is about 427.9471795531.

The spelling of 78373728 in words is "seventy-eight million, three hundred seventy-three thousand, seven hundred twenty-eight".