79776749 has 4 divisors (see below), whose sum is σ = 85913436. Its totient is φ = 73640064.

The previous prime is 79776737. The next prime is 79776761. The reversal of 79776749 is 94767797.

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

It is an interprime number because it is at equal distance from previous prime (79776737) and next prime (79776761).

It can be written as a sum of positive squares in 2 ways, for example, as 24571849 + 55204900 = 4957^2 + 7430^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79776749 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 79776694 and 79776703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79776799) 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, 3068324 + ... + 3068349.

It is an arithmetic number, because the mean of its divisors is an integer number (21478359).

Almost surely, 2^79776749 is an apocalyptic number.

It is an amenable number.

79776749 is a deficient number, since it is larger than the sum of its proper divisors (6136687).

79776749 is a wasteful number, since it uses less digits than its factorization.

79776749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6136686.

The product of its digits is 4667544, while the sum is 56.

The square root of 79776749 is about 8931.7830806620. The cubic root of 79776749 is about 430.4857481670.

The spelling of 79776749 in words is "seventy-nine million, seven hundred seventy-six thousand, seven hundred forty-nine".