78278892 has 24 divisors (see below), whose sum is σ = 183332352. Its totient is φ = 25995600.

The previous prime is 78278891. The next prime is 78278909. The reversal of 78278892 is 29887287.

It is a happy number.

78278892 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×78278892² = 12255169865495328, which contains 22 as substring.

78278892 is strictly pandigital in base 9.

It is not an unprimeable number, because it can be changed into a prime (78278891) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 8784 + ... + 15287.

It is an arithmetic number, because the mean of its divisors is an integer number (7638848).

Almost surely, 2^78278892 is an apocalyptic number.

It is an amenable number.

78278892 is an abundant number, since it is smaller than the sum of its proper divisors (105053460).

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

78278892 is a wasteful number, since it uses less digits than its factorization.

78278892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24349 (or 24347 counting only the distinct ones).

The product of its digits is 903168, while the sum is 51.

The square root of 78278892 is about 8847.5359281554. The cubic root of 78278892 is about 427.7744976242.

The spelling of 78278892 in words is "seventy-eight million, two hundred seventy-eight thousand, eight hundred ninety-two".