78000081 has 12 divisors (see below), whose sum is σ = 106605456. Its totient is φ = 50728480.

The previous prime is 78000071. The next prime is 78000089. The reversal of 78000081 is 18000087.

It is not a de Polignac number, because 78000081 - 2⁵ = 78000049 is a prime.

It is a super-2 number, since 2×78000081² = 12168025272013122, which contains 22 as substring.

78000081 is a modest number, since divided by 81 gives 78 as remainder.

It is not an unprimeable number, because it can be changed into a prime (78000089) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2691 + ... + 12776.

It is an arithmetic number, because the mean of its divisors is an integer number (8883788).

Almost surely, 2^78000081 is an apocalyptic number.

It is an amenable number.

78000081 is a deficient number, since it is larger than the sum of its proper divisors (28605375).

78000081 is a wasteful number, since it uses less digits than its factorization.

78000081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15552 (or 15511 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 78000081 is about 8831.7654520486. The cubic root of 78000081 is about 427.2660160695.

The spelling of 78000081 in words is "seventy-eight million, eighty-one", and thus it is an aban number and an uban number.