77444999 has 2 divisors, whose sum is σ = 77445000. Its totient is φ = 77444998.

The previous prime is 77444989. The next prime is 77445061. The reversal of 77444999 is 99944477.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77444999 is a prime.

It is a super-2 number, since 2×77444999² = 11995455740220002, which contains 22 as substring.

It is a Chen prime.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 77444999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77444989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38722499 + 38722500.

It is an arithmetic number, because the mean of its divisors is an integer number (38722500).

Almost surely, 2^77444999 is an apocalyptic number.

77444999 is a deficient number, since it is larger than the sum of its proper divisors (1).

77444999 is an equidigital number, since it uses as much as digits as its factorization.

77444999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 53.

The square root of 77444999 is about 8800.2840295072. The cubic root of 77444999 is about 426.2500662476.

The spelling of 77444999 in words is "seventy-seven million, four hundred forty-four thousand, nine hundred ninety-nine".