78772861 has 12 divisors (see below), whose sum is σ = 84286048. Its totient is φ = 73574424.

The previous prime is 78772831. The next prime is 78772901. The reversal of 78772861 is 16827787.

It is a de Polignac number, because none of the positive numbers 2^k-78772861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78772801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21016 + ... + 24478.

Almost surely, 2^78772861 is an apocalyptic number.

It is an amenable number.

78772861 is a deficient number, since it is larger than the sum of its proper divisors (5513187).

78772861 is a wasteful number, since it uses less digits than its factorization.

78772861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3552 (or 3529 counting only the distinct ones).

The product of its digits is 263424, while the sum is 46.

The square root of 78772861 is about 8875.4076526095. The cubic root of 78772861 is about 428.6724170637.

The spelling of 78772861 in words is "seventy-eight million, seven hundred seventy-two thousand, eight hundred sixty-one".