77439485 has 4 divisors (see below), whose sum is σ = 92927388. Its totient is φ = 61951584.

The previous prime is 77439473. The next prime is 77439491. The reversal of 77439485 is 58493477.

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 40691641 + 36747844 = 6379^2 + 6062^2 .

It is a cyclic number.

It is not a de Polignac number, because 77439485 - 2⁴ = 77439469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7743944 + ... + 7743953.

It is an arithmetic number, because the mean of its divisors is an integer number (23231847).

Almost surely, 2^77439485 is an apocalyptic number.

It is an amenable number.

77439485 is a deficient number, since it is larger than the sum of its proper divisors (15487903).

77439485 is a wasteful number, since it uses less digits than its factorization.

77439485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15487902.

The product of its digits is 846720, while the sum is 47.

The square root of 77439485 is about 8799.9707385877. The cubic root of 77439485 is about 426.2399498265.

The spelling of 77439485 in words is "seventy-seven million, four hundred thirty-nine thousand, four hundred eighty-five".