78186940 has 24 divisors (see below), whose sum is σ = 176823360. Its totient is φ = 28868928.

The previous prime is 78186863. The next prime is 78186967. The reversal of 78186940 is 4968187.

It is a super-2 number, since 2×78186940² = 12226395173127200, which contains 22 as substring.

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, 150100 + ... + 150619.

It is an arithmetic number, because the mean of its divisors is an integer number (7367640).

Almost surely, 2^78186940 is an apocalyptic number.

It is an amenable number.

78186940 is an abundant number, since it is smaller than the sum of its proper divisors (98636420).

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

78186940 is a wasteful number, since it uses less digits than its factorization.

78186940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300741 (or 300739 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 78186940 is about 8842.3379261370. The cubic root of 78186940 is about 427.6069337959.

The spelling of 78186940 in words is "seventy-eight million, one hundred eighty-six thousand, nine hundred forty".