78328724 has 24 divisors (see below), whose sum is σ = 146200320. Its totient is φ = 36590976.

The previous prime is 78328721. The next prime is 78328727. The reversal of 78328724 is 42782387.

It is an interprime number because it is at equal distance from previous prime (78328721) and next prime (78328727).

It is a super-2 number, since 2×78328724² = 12270778006936352, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78328721) 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, 5309 + ... + 13595.

It is an arithmetic number, because the mean of its divisors is an integer number (6091680).

Almost surely, 2^78328724 is an apocalyptic number.

It is an amenable number.

78328724 is a deficient number, since it is larger than the sum of its proper divisors (67871596).

78328724 is a wasteful number, since it uses less digits than its factorization.

78328724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8447 (or 8445 counting only the distinct ones).

The product of its digits is 150528, while the sum is 41.

The square root of 78328724 is about 8850.3516314325. The cubic root of 78328724 is about 427.8652514933.

The spelling of 78328724 in words is "seventy-eight million, three hundred twenty-eight thousand, seven hundred twenty-four".