77616986 has 4 divisors (see below), whose sum is σ = 116425482. Its totient is φ = 38808492.

The previous prime is 77616971. The next prime is 77616997. The reversal of 77616986 is 68961677.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68961677 = 1451 ⋅47527.

It can be written as a sum of positive squares in only one way, i.e., 58997761 + 18619225 = 7681^2 + 4315^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19404245 + ... + 19404248.

Almost surely, 2^77616986 is an apocalyptic number.

77616986 is a deficient number, since it is larger than the sum of its proper divisors (38808496).

77616986 is a wasteful number, since it uses less digits than its factorization.

77616986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38808495.

The product of its digits is 762048, while the sum is 50.

The square root of 77616986 is about 8810.0502836249. The cubic root of 77616986 is about 426.5653664403.

The spelling of 77616986 in words is "seventy-seven million, six hundred sixteen thousand, nine hundred eighty-six".