76978947 has 4 divisors (see below), whose sum is σ = 102638600. Its totient is φ = 51319296.

The previous prime is 76978933. The next prime is 76978969. The reversal of 76978947 is 74987967.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 76978947 - 2⁷ = 76978819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76970947) 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, 12829822 + ... + 12829827.

It is an arithmetic number, because the mean of its divisors is an integer number (25659650).

Almost surely, 2^76978947 is an apocalyptic number.

76978947 is a deficient number, since it is larger than the sum of its proper divisors (25659653).

76978947 is a wasteful number, since it uses less digits than its factorization.

76978947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25659652.

The product of its digits is 5334336, while the sum is 57.

The square root of 76978947 is about 8773.7646993751. The cubic root of 76978947 is about 425.3933097230.

The spelling of 76978947 in words is "seventy-six million, nine hundred seventy-eight thousand, nine hundred forty-seven".