77485 has 4 divisors (see below), whose sum is σ = 92988. Its totient is φ = 61984.

The previous prime is 77479. The next prime is 77489. The reversal of 77485 is 58477.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56169 + 21316 = 237^2 + 146^2 .

It is a cyclic number.

It is not a de Polignac number, because 77485 - 2³ = 77477 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77489) 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, 7744 + ... + 7753.

It is an arithmetic number, because the mean of its divisors is an integer number (23247).

2⁷⁷⁴⁸⁵ is an apocalyptic number.

It is an amenable number.

77485 is a deficient number, since it is larger than the sum of its proper divisors (15503).

77485 is a wasteful number, since it uses less digits than its factorization.

77485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15502.

The product of its digits is 7840, while the sum is 31.

The square root of 77485 is about 278.3612760425. The cubic root of 77485 is about 42.6323440876.

The spelling of 77485 in words is "seventy-seven thousand, four hundred eighty-five".