77039819 has 4 divisors (see below), whose sum is σ = 77370696. Its totient is φ = 76708944.

The previous prime is 77039791. The next prime is 77039839. The reversal of 77039819 is 91893077.

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

It is a cyclic number.

It is not a de Polignac number, because 77039819 - 2¹² = 77035723 is a prime.

It is a super-2 number, since 2×77039819² = 11870267423105522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77039819.

It is not an unprimeable number, because it can be changed into a prime (77039839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165089 + ... + 165554.

It is an arithmetic number, because the mean of its divisors is an integer number (19342674).

Almost surely, 2^77039819 is an apocalyptic number.

77039819 is a deficient number, since it is larger than the sum of its proper divisors (330877).

77039819 is a wasteful number, since it uses less digits than its factorization.

77039819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330876.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 77039819 is about 8777.2329922362. The cubic root of 77039819 is about 425.5054084205.

The spelling of 77039819 in words is "seventy-seven million, thirty-nine thousand, eight hundred nineteen".