78887977 has 8 divisors (see below), whose sum is σ = 92356992. Its totient is φ = 65968800.

The previous prime is 78887971. The next prime is 78887989. The reversal of 78887977 is 77978887.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 78887977 - 2¹⁵ = 78855209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78887971) 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, 137149 + ... + 137722.

It is an arithmetic number, because the mean of its divisors is an integer number (11544624).

Almost surely, 2^78887977 is an apocalyptic number.

It is an amenable number.

78887977 is a deficient number, since it is larger than the sum of its proper divisors (13469015).

78887977 is a wasteful number, since it uses less digits than its factorization.

78887977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274919.

The product of its digits is 11063808, while the sum is 61.

The square root of 78887977 is about 8881.8903956309. The cubic root of 78887977 is about 428.8811312274.

The spelling of 78887977 in words is "seventy-eight million, eight hundred eighty-seven thousand, nine hundred seventy-seven".