77973789 has 16 divisors (see below), whose sum is σ = 105364800. Its totient is φ = 51287040.

The previous prime is 77973787. The next prime is 77973823. The reversal of 77973789 is 98737977.

It is not a de Polignac number, because 77973789 - 2¹ = 77973787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77973787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143859 + ... + 144399.

It is an arithmetic number, because the mean of its divisors is an integer number (6585300).

Almost surely, 2^77973789 is an apocalyptic number.

It is an amenable number.

77973789 is a deficient number, since it is larger than the sum of its proper divisors (27391011).

77973789 is a wasteful number, since it uses less digits than its factorization.

77973789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100.

The product of its digits is 4667544, while the sum is 57.

The square root of 77973789 is about 8830.2768359775. The cubic root of 77973789 is about 427.2180035529.

The spelling of 77973789 in words is "seventy-seven million, nine hundred seventy-three thousand, seven hundred eighty-nine".