77474889 has 6 divisors (see below), whose sum is σ = 111908186. Its totient is φ = 51649920.

The previous prime is 77474869. The next prime is 77474893. The reversal of 77474889 is 98847477.

It can be written as a sum of positive squares in only one way, i.e., 67815225 + 9659664 = 8235^2 + 3108^2 .

It is not a de Polignac number, because 77474889 - 2¹⁵ = 77442121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77474809) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4304152 + ... + 4304169.

Almost surely, 2^77474889 is an apocalyptic number.

It is an amenable number.

77474889 is a deficient number, since it is larger than the sum of its proper divisors (34433297).

77474889 is a wasteful number, since it uses less digits than its factorization.

77474889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8608327 (or 8608324 counting only the distinct ones).

The product of its digits is 3161088, while the sum is 54.

The square root of 77474889 is about 8801.9821063213. The cubic root of 77474889 is about 426.3048964536.

The spelling of 77474889 in words is "seventy-seven million, four hundred seventy-four thousand, eight hundred eighty-nine".