77954985 has 12 divisors (see below), whose sum is σ = 135122052. Its totient is φ = 41575968.

The previous prime is 77954983. The next prime is 77955019. The reversal of 77954985 is 58945977.

It can be written as a sum of positive squares in 2 ways, for example, as 40793769 + 37161216 = 6387^2 + 6096^2 .

It is not a de Polignac number, because 77954985 - 2¹ = 77954983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77954983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 866122 + ... + 866211.

It is an arithmetic number, because the mean of its divisors is an integer number (11260171).

Almost surely, 2^77954985 is an apocalyptic number.

It is an amenable number.

77954985 is a deficient number, since it is larger than the sum of its proper divisors (57167067).

77954985 is a wasteful number, since it uses less digits than its factorization.

77954985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1732344 (or 1732341 counting only the distinct ones).

The product of its digits is 3175200, while the sum is 54.

The square root of 77954985 is about 8829.2120259964. The cubic root of 77954985 is about 427.1836584510.

The spelling of 77954985 in words is "seventy-seven million, nine hundred fifty-four thousand, nine hundred eighty-five".