77946685 has 4 divisors (see below), whose sum is σ = 93536028. Its totient is φ = 62357344.

The previous prime is 77946667. The next prime is 77946697. The reversal of 77946685 is 58664977.

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 14122564 + 63824121 = 3758^2 + 7989^2 .

It is a cyclic number.

It is not a de Polignac number, because 77946685 - 2¹⁵ = 77913917 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, 7794664 + ... + 7794673.

It is an arithmetic number, because the mean of its divisors is an integer number (23384007).

Almost surely, 2^77946685 is an apocalyptic number.

It is an amenable number.

77946685 is a deficient number, since it is larger than the sum of its proper divisors (15589343).

77946685 is a wasteful number, since it uses less digits than its factorization.

77946685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15589342.

The product of its digits is 2540160, while the sum is 52.

The square root of 77946685 is about 8828.7419828648. The cubic root of 77946685 is about 427.1684969224.

The spelling of 77946685 in words is "seventy-seven million, nine hundred forty-six thousand, six hundred eighty-five".