77244409 has 4 divisors (see below), whose sum is σ = 84266640. Its totient is φ = 70222180.

The previous prime is 77244389. The next prime is 77244421. The reversal of 77244409 is 90444277.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77244409 - 2¹³ = 77236217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77214409) 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, 3511099 + ... + 3511120.

It is an arithmetic number, because the mean of its divisors is an integer number (21066660).

Almost surely, 2^77244409 is an apocalyptic number.

It is an amenable number.

77244409 is a deficient number, since it is larger than the sum of its proper divisors (7022231).

77244409 is a wasteful number, since it uses less digits than its factorization.

77244409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7022230.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 77244409 is about 8788.8798489910. The cubic root of 77244409 is about 425.8817384995.

The spelling of 77244409 in words is "seventy-seven million, two hundred forty-four thousand, four hundred nine".