77444899 has 4 divisors (see below), whose sum is σ = 88508464. Its totient is φ = 66381336.

The previous prime is 77444891. The next prime is 77444921. The reversal of 77444899 is 99844477.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99844477 = 29 ⋅3442913.

It is not a de Polignac number, because 77444899 - 2³ = 77444891 is a prime.

It is a super-2 number, since 2×77444899² = 11995424762240402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77444891) 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, 5531772 + ... + 5531785.

It is an arithmetic number, because the mean of its divisors is an integer number (22127116).

Almost surely, 2^77444899 is an apocalyptic number.

77444899 is a deficient number, since it is larger than the sum of its proper divisors (11063565).

77444899 is a wasteful number, since it uses less digits than its factorization.

77444899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11063564.

The product of its digits is 2032128, while the sum is 52.

The square root of 77444899 is about 8800.2783478706. The cubic root of 77444899 is about 426.2498827839.

The spelling of 77444899 in words is "seventy-seven million, four hundred forty-four thousand, eight hundred ninety-nine".