77974849 has 4 divisors (see below), whose sum is σ = 78324736. Its totient is φ = 77624964.

The previous prime is 77974789. The next prime is 77974891. The reversal of 77974849 is 94847977.

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.

It is a cyclic number.

It is not a de Polignac number, because 77974849 - 2²³ = 69586241 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77974849.

It is not an unprimeable number, because it can be changed into a prime (77974249) 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, 174609 + ... + 175054.

It is an arithmetic number, because the mean of its divisors is an integer number (19581184).

Almost surely, 2^77974849 is an apocalyptic number.

It is an amenable number.

77974849 is a deficient number, since it is larger than the sum of its proper divisors (349887).

77974849 is a wasteful number, since it uses less digits than its factorization.

77974849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349886.

The product of its digits is 3556224, while the sum is 55.

The square root of 77974849 is about 8830.3368565418. The cubic root of 77974849 is about 427.2199394557.

The spelling of 77974849 in words is "seventy-seven million, nine hundred seventy-four thousand, eight hundred forty-nine".