78347144 has 32 divisors (see below), whose sum is σ = 151632000. Its totient is φ = 37931712.

The previous prime is 78347141. The next prime is 78347147. The reversal of 78347144 is 44174387.

It is an interprime number because it is at equal distance from previous prime (78347141) and next prime (78347147).

It is a super-2 number, since 2×78347144² = 12276549945913472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78347098 and 78347107.

It is not an unprimeable number, because it can be changed into a prime (78347141) 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, 32327 + ... + 34665.

It is an arithmetic number, because the mean of its divisors is an integer number (4738500).

Almost surely, 2^78347144 is an apocalyptic number.

It is an amenable number.

78347144 is a deficient number, since it is larger than the sum of its proper divisors (73284856).

78347144 is a wasteful number, since it uses less digits than its factorization.

78347144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2477 (or 2473 counting only the distinct ones).

The product of its digits is 75264, while the sum is 38.

The square root of 78347144 is about 8851.3922068791. The cubic root of 78347144 is about 427.8987881910.

The spelling of 78347144 in words is "seventy-eight million, three hundred forty-seven thousand, one hundred forty-four".