77827489 has 4 divisors (see below), whose sum is σ = 77953840. Its totient is φ = 77701140.

The previous prime is 77827487. The next prime is 77827499. The reversal of 77827489 is 98472877.

It is a happy number.

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 77827489 - 2¹ = 77827487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77827481) 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, 62247 + ... + 63484.

It is an arithmetic number, because the mean of its divisors is an integer number (19488460).

Almost surely, 2^77827489 is an apocalyptic number.

It is an amenable number.

77827489 is a deficient number, since it is larger than the sum of its proper divisors (126351).

77827489 is a wasteful number, since it uses less digits than its factorization.

77827489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126350.

The product of its digits is 1580544, while the sum is 52.

The square root of 77827489 is about 8821.9889480774. The cubic root of 77827489 is about 426.9506439451.

The spelling of 77827489 in words is "seventy-seven million, eight hundred twenty-seven thousand, four hundred eighty-nine".