78906881 has 8 divisors (see below), whose sum is σ = 79897440. Its totient is φ = 77920128.

The previous prime is 78906853. The next prime is 78906887. The reversal of 78906881 is 18860987.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78906881 is a prime.

It is a super-2 number, since 2×78906881² = 12452591738296322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78906887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82850 + ... + 83796.

It is an arithmetic number, because the mean of its divisors is an integer number (9987180).

Almost surely, 2^78906881 is an apocalyptic number.

It is an amenable number.

78906881 is a deficient number, since it is larger than the sum of its proper divisors (990559).

78906881 is an equidigital number, since it uses as much as digits as its factorization.

78906881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1903.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 78906881 is about 8882.9545197530. The cubic root of 78906881 is about 428.9153862207.

The spelling of 78906881 in words is "seventy-eight million, nine hundred six thousand, eight hundred eighty-one".