77971516 has 24 divisors (see below), whose sum is σ = 164151680. Its totient is φ = 31657392.

The previous prime is 77971511. The next prime is 77971577. The reversal of 77971516 is 61517977.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77971511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72750 + ... + 73813.

Almost surely, 2^77971516 is an apocalyptic number.

77971516 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

77971516 is an abundant number, since it is smaller than the sum of its proper divisors (86180164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77971516 is a wasteful number, since it uses less digits than its factorization.

77971516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146593 (or 146591 counting only the distinct ones).

The product of its digits is 92610, while the sum is 43.

The square root of 77971516 is about 8830.1481301278. The cubic root of 77971516 is about 427.2138522607.

It can be divided in two parts, 77971 and 516, that added together give a palindrome (78487).

The spelling of 77971516 in words is "seventy-seven million, nine hundred seventy-one thousand, five hundred sixteen".