78391960 has 16 divisors (see below), whose sum is σ = 176382000. Its totient is φ = 31356768.

The previous prime is 78391949. The next prime is 78391979. The reversal of 78391960 is 6919387.

It is a super-2 number, since 2×78391960² = 12290598785283200, 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 979860 + ... + 979939.

It is an arithmetic number, because the mean of its divisors is an integer number (11023875).

Almost surely, 2^78391960 is an apocalyptic number.

It is an amenable number.

78391960 is an abundant number, since it is smaller than the sum of its proper divisors (97990040).

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

78391960 is a wasteful number, since it uses less digits than its factorization.

78391960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1959810 (or 1959806 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 78391960 is about 8853.9234241098. The cubic root of 78391960 is about 427.9803612848.

The spelling of 78391960 in words is "seventy-eight million, three hundred ninety-one thousand, nine hundred sixty".