78155244 has 36 divisors (see below), whose sum is σ = 198514680. Its totient is φ = 25925760.

The previous prime is 78155237. The next prime is 78155249. The reversal of 78155244 is 44255187.

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

It is a super-2 number, since 2×78155244² = 12216484329399072, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 78155199 and 78155208.

It is not an unprimeable number, because it can be changed into a prime (78155249) 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 11 ways as a sum of consecutive naturals, for example, 2452 + ... + 12740.

Almost surely, 2^78155244 is an apocalyptic number.

It is an amenable number.

78155244 is an abundant number, since it is smaller than the sum of its proper divisors (120359436).

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

78155244 is a wasteful number, since it uses less digits than its factorization.

78155244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10510 (or 10505 counting only the distinct ones).

The product of its digits is 44800, while the sum is 36.

The square root of 78155244 is about 8840.5454582848. The cubic root of 78155244 is about 427.5491438323.

The spelling of 78155244 in words is "seventy-eight million, one hundred fifty-five thousand, two hundred forty-four".