78977089 has 4 divisors (see below), whose sum is σ = 79351600. Its totient is φ = 78602580.

The previous prime is 78977071. The next prime is 78977113. The reversal of 78977089 is 98077987.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98077987 = 7 ⋅14011141.

It is a cyclic number.

It is not a de Polignac number, because 78977089 - 2¹¹ = 78975041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78975089) 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, 186939 + ... + 187360.

It is an arithmetic number, because the mean of its divisors is an integer number (19837900).

Almost surely, 2^78977089 is an apocalyptic number.

It is an amenable number.

78977089 is a deficient number, since it is larger than the sum of its proper divisors (374511).

78977089 is a wasteful number, since it uses less digits than its factorization.

78977089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374510.

The product of its (nonzero) digits is 1778112, while the sum is 55.

The square root of 78977089 is about 8886.9054794118. The cubic root of 78977089 is about 429.0425587575.

The spelling of 78977089 in words is "seventy-eight million, nine hundred seventy-seven thousand, eighty-nine".