78278000 has 40 divisors (see below), whose sum is σ = 189281040. Its totient is φ = 31310400.

The previous prime is 78277963. The next prime is 78278029. The reversal of 78278000 is 87287.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×78278000² = 12254890568000000, which contains 22 as substring.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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, 17570 + ... + 21569.

It is an arithmetic number, because the mean of its divisors is an integer number (4732026).

Almost surely, 2^78278000 is an apocalyptic number.

It is an amenable number.

78278000 is an abundant number, since it is smaller than the sum of its proper divisors (111003040).

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

78278000 is a wasteful number, since it uses less digits than its factorization.

78278000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39162 (or 39146 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 78278000 is about 8847.4855184962. The cubic root of 78278000 is about 427.7728727660.

The spelling of 78278000 in words is "seventy-eight million, two hundred seventy-eight thousand".