78012556 has 12 divisors (see below), whose sum is σ = 143707480. Its totient is φ = 36953280.

The previous prime is 78012553. The next prime is 78012559. The reversal of 78012556 is 65521087.

It is an interprime number because it is at equal distance from previous prime (78012553) and next prime (78012559).

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (78012551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 513165 + ... + 513316.

Almost surely, 2^78012556 is an apocalyptic number.

78012556 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

78012556 is a deficient number, since it is larger than the sum of its proper divisors (65694924).

78012556 is a wasteful number, since it uses less digits than its factorization.

78012556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026504 (or 1026502 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 78012556 is about 8832.4716812453. The cubic root of 78012556 is about 427.2887932228.

The spelling of 78012556 in words is "seventy-eight million, twelve thousand, five hundred fifty-six".