78157660 has 48 divisors (see below), whose sum is σ = 191955456. Its totient is φ = 26171712.

The previous prime is 78157637. The next prime is 78157679. The reversal of 78157660 is 6675187.

It is a super-2 number, since 2×78157660² = 12217239633351200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 472 + ... + 12511.

It is an arithmetic number, because the mean of its divisors is an integer number (3999072).

Almost surely, 2^78157660 is an apocalyptic number.

78157660 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78157660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95977728).

78157660 is an abundant number, since it is smaller than the sum of its proper divisors (113797796).

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

78157660 is a wasteful number, since it uses less digits than its factorization.

78157660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13042 (or 13040 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 78157660 is about 8840.6821003812. The cubic root of 78157660 is about 427.5535493720.

The spelling of 78157660 in words is "seventy-eight million, one hundred fifty-seven thousand, six hundred sixty".