77880019 has 4 divisors (see below), whose sum is σ = 89005744. Its totient is φ = 66754296.

The previous prime is 77880013. The next prime is 77880053. The reversal of 77880019 is 91008877.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91008877 = 1021 ⋅89137.

It is not a de Polignac number, because 77880019 - 2⁷ = 77879891 is a prime.

It is a super-2 number, since 2×77880019² = 12130594718880722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77880013) 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, 5562852 + ... + 5562865.

It is an arithmetic number, because the mean of its divisors is an integer number (22251436).

Almost surely, 2^77880019 is an apocalyptic number.

77880019 is a deficient number, since it is larger than the sum of its proper divisors (11125725).

77880019 is a wasteful number, since it uses less digits than its factorization.

77880019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11125724.

The product of its (nonzero) digits is 28224, while the sum is 40.

The square root of 77880019 is about 8824.9656656556. The cubic root of 77880019 is about 427.0466797357.

The spelling of 77880019 in words is "seventy-seven million, eight hundred eighty thousand, nineteen".