77491079 has 4 divisors (see below), whose sum is σ = 77511984. Its totient is φ = 77470176.

The previous prime is 77491067. The next prime is 77491087. The reversal of 77491079 is 97019477.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77491079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77491039) 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, 3227 + ... + 12860.

It is an arithmetic number, because the mean of its divisors is an integer number (19377996).

Almost surely, 2^77491079 is an apocalyptic number.

77491079 is a deficient number, since it is larger than the sum of its proper divisors (20905).

77491079 is a wasteful number, since it uses less digits than its factorization.

77491079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20904.

The product of its (nonzero) digits is 111132, while the sum is 44.

The square root of 77491079 is about 8802.9017374954. The cubic root of 77491079 is about 426.3345894963.

The spelling of 77491079 in words is "seventy-seven million, four hundred ninety-one thousand, seventy-nine".