78156144 has 80 divisors (see below), whose sum is σ = 244746240. Its totient is φ = 23682240.

The previous prime is 78156137. The next prime is 78156193. The reversal of 78156144 is 44165187.

It is a happy number.

It is a super-2 number, since 2×78156144² = 12216765689897472, 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 = 78156099 and 78156108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3472 + ... + 12975.

It is an arithmetic number, because the mean of its divisors is an integer number (3059328).

Almost surely, 2^78156144 is an apocalyptic number.

It is an amenable number.

78156144 is an abundant number, since it is smaller than the sum of its proper divisors (166590096).

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

78156144 is a wasteful number, since it uses less digits than its factorization.

78156144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16475 (or 16463 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 78156144 is about 8840.5963599748. The cubic root of 78156144 is about 427.5507849794.

The spelling of 78156144 in words is "seventy-eight million, one hundred fifty-six thousand, one hundred forty-four".