77530985 has 12 divisors (see below), whose sum is σ = 108227268. Its totient is φ = 53163936.

The previous prime is 77530961. The next prime is 77531009. The reversal of 77530985 is 58903577.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (77530961) and next prime (77531009).

It can be written as a sum of positive squares in 2 ways, for example, as 13402921 + 64128064 = 3661^2 + 8008^2 .

It is a de Polignac number, because none of the positive numbers 2^k-77530985 is a prime.

It is a super-2 number, since 2×77530985² = 12022107270140450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 157982 + ... + 158471.

It is an arithmetic number, because the mean of its divisors is an integer number (9018939).

Almost surely, 2^77530985 is an apocalyptic number.

It is an amenable number.

77530985 is a deficient number, since it is larger than the sum of its proper divisors (30696283).

77530985 is a wasteful number, since it uses less digits than its factorization.

77530985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316472 (or 316465 counting only the distinct ones).

The product of its (nonzero) digits is 264600, while the sum is 44.

The square root of 77530985 is about 8805.1680847103. The cubic root of 77530985 is about 426.4077608802.

The spelling of 77530985 in words is "seventy-seven million, five hundred thirty thousand, nine hundred eighty-five".