78280774 has 16 divisors (see below), whose sum is σ = 137949840. Its totient is φ = 32844960.

The previous prime is 78280759. The next prime is 78280781. The reversal of 78280774 is 47708287.

It is a super-2 number, since 2×78280774² = 12255759156078152, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78280774.

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, 136569 + ... + 137140.

It is an arithmetic number, because the mean of its divisors is an integer number (8621865).

Almost surely, 2^78280774 is an apocalyptic number.

78280774 is a deficient number, since it is larger than the sum of its proper divisors (59669066).

78280774 is a wasteful number, since it uses less digits than its factorization.

78280774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273735.

The product of its (nonzero) digits is 175616, while the sum is 43.

The square root of 78280774 is about 8847.6422848124. The cubic root of 78280774 is about 427.7779258159. Note that the first 3 decimals are identical.

The spelling of 78280774 in words is "seventy-eight million, two hundred eighty thousand, seven hundred seventy-four".