78977051 has 4 divisors (see below), whose sum is σ = 79759104. Its totient is φ = 78195000.

The previous prime is 78977033. The next prime is 78977071. The reversal of 78977051 is 15077987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15077987 = 101 ⋅149287.

It is a cyclic number.

It is not a de Polignac number, because 78977051 - 2¹⁸ = 78714907 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78976993 and 78977011.

It is not an unprimeable number, because it can be changed into a prime (78977071) 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, 390875 + ... + 391076.

It is an arithmetic number, because the mean of its divisors is an integer number (19939776).

Almost surely, 2^78977051 is an apocalyptic number.

78977051 is a deficient number, since it is larger than the sum of its proper divisors (782053).

78977051 is a wasteful number, since it uses less digits than its factorization.

78977051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782052.

The product of its (nonzero) digits is 123480, while the sum is 44.

The square root of 78977051 is about 8886.9033414345. The cubic root of 78977051 is about 429.0424899459.

The spelling of 78977051 in words is "seventy-eight million, nine hundred seventy-seven thousand, fifty-one".