77476989 has 4 divisors (see below), whose sum is σ = 103302656. Its totient is φ = 51651324.

The previous prime is 77476979. The next prime is 77477027. The reversal of 77476989 is 98967477.

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 not a de Polignac number, because 77476989 - 2⁵ = 77476957 is a prime.

It is a super-2 number, since 2×77476989² = 12005367649012242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77476969) 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, 12912829 + ... + 12912834.

It is an arithmetic number, because the mean of its divisors is an integer number (25825664).

Almost surely, 2^77476989 is an apocalyptic number.

It is an amenable number.

77476989 is a deficient number, since it is larger than the sum of its proper divisors (25825667).

77476989 is a wasteful number, since it uses less digits than its factorization.

77476989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25825666.

The product of its digits is 5334336, while the sum is 57.

The square root of 77476989 is about 8802.1013968256. The cubic root of 77476989 is about 426.3087481626.

The spelling of 77476989 in words is "seventy-seven million, four hundred seventy-six thousand, nine hundred eighty-nine".