78390884 has 48 divisors (see below), whose sum is σ = 169673280. Its totient is φ = 31155840.

The previous prime is 78390883. The next prime is 78390889. The reversal of 78390884 is 48809387.

It is a super-2 number, since 2×78390884² = 12290261388602912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78390883) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 7262 + ... + 14474.

It is an arithmetic number, because the mean of its divisors is an integer number (3534860).

Almost surely, 2^78390884 is an apocalyptic number.

It is an amenable number.

78390884 is an abundant number, since it is smaller than the sum of its proper divisors (91282396).

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

78390884 is a wasteful number, since it uses less digits than its factorization.

78390884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7260 (or 7258 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 47.

The square root of 78390884 is about 8853.8626598790. The cubic root of 78390884 is about 427.9784031377.

The spelling of 78390884 in words is "seventy-eight million, three hundred ninety thousand, eight hundred eighty-four".