77772489 has 4 divisors (see below), whose sum is σ = 103696656. Its totient is φ = 51848324.

The previous prime is 77772469. The next prime is 77772493. The reversal of 77772489 is 98427777.

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 77772489 - 2¹⁵ = 77739721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77772469) 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, 12962079 + ... + 12962084.

It is an arithmetic number, because the mean of its divisors is an integer number (25924164).

Almost surely, 2^77772489 is an apocalyptic number.

It is an amenable number.

77772489 is a deficient number, since it is larger than the sum of its proper divisors (25924167).

77772489 is a wasteful number, since it uses less digits than its factorization.

77772489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25924166.

The product of its digits is 1382976, while the sum is 51.

The square root of 77772489 is about 8818.8711862687. The cubic root of 77772489 is about 426.8500461594.

The spelling of 77772489 in words is "seventy-seven million, seven hundred seventy-two thousand, four hundred eighty-nine".