78876773 has 4 divisors (see below), whose sum is σ = 80365068. Its totient is φ = 77388480.

The previous prime is 78876769. The next prime is 78876793. The reversal of 78876773 is 37767887.

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 23493409 + 55383364 = 4847^2 + 7442^2 .

It is not a de Polignac number, because 78876773 - 2² = 78876769 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 1488241 = 78876773 / (7 + 8 + 8 + 7 + 6 + 7 + 7 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78876703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 744068 + ... + 744173.

It is an arithmetic number, because the mean of its divisors is an integer number (20091267).

Almost surely, 2^78876773 is an apocalyptic number.

It is an amenable number.

78876773 is a deficient number, since it is larger than the sum of its proper divisors (1488295).

78876773 is a wasteful number, since it uses less digits than its factorization.

78876773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1488294.

The product of its digits is 2765952, while the sum is 53.

The square root of 78876773 is about 8881.2596516485. The cubic root of 78876773 is about 428.8608264362.

The spelling of 78876773 in words is "seventy-eight million, eight hundred seventy-six thousand, seven hundred seventy-three".