78861340 has 24 divisors (see below), whose sum is σ = 165780720. Its totient is φ = 31511808.

The previous prime is 78861337. The next prime is 78861397. The reversal of 78861340 is 4316887.

It is a happy number.

It is a super-2 number, since 2×78861340² = 12438221893191200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78861340.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29791 + ... + 32329.

It is an arithmetic number, because the mean of its divisors is an integer number (6907530).

Almost surely, 2^78861340 is an apocalyptic number.

It is an amenable number.

78861340 is an abundant number, since it is smaller than the sum of its proper divisors (86919380).

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

78861340 is a wasteful number, since it uses less digits than its factorization.

78861340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4101 (or 4099 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 78861340 is about 8880.3907571683. The cubic root of 78861340 is about 428.8328543620.

It can be divided in two parts, 788 and 61340, that added together give a triangular number (62128 = T₃₅₂).

The spelling of 78861340 in words is "seventy-eight million, eight hundred sixty-one thousand, three hundred forty".