78076581 has 12 divisors (see below), whose sum is σ = 114426816. Its totient is φ = 47318920.

The previous prime is 78076577. The next prime is 78076601. The reversal of 78076581 is 18567087.

It is not a de Polignac number, because 78076581 - 2² = 78076577 is a prime.

It is a super-2 number, since 2×78076581² = 12191905001299122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78076181) 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, 107181 + ... + 107906.

It is an arithmetic number, because the mean of its divisors is an integer number (9535568).

Almost surely, 2^78076581 is an apocalyptic number.

It is an amenable number.

78076581 is a deficient number, since it is larger than the sum of its proper divisors (36350235).

78076581 is a wasteful number, since it uses less digits than its factorization.

78076581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215112 (or 215101 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 42.

The square root of 78076581 is about 8836.0953480596. The cubic root of 78076581 is about 427.4056534044.

The spelling of 78076581 in words is "seventy-eight million, seventy-six thousand, five hundred eighty-one".