78819765 has 8 divisors (see below), whose sum is σ = 126111648. Its totient is φ = 42037200.

The previous prime is 78819751. The next prime is 78819821. The reversal of 78819765 is 56791887.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78819765 - 2¹⁰ = 78818741 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2627311 + ... + 2627340.

It is an arithmetic number, because the mean of its divisors is an integer number (15763956).

Almost surely, 2^78819765 is an apocalyptic number.

It is an amenable number.

78819765 is a deficient number, since it is larger than the sum of its proper divisors (47291883).

78819765 is a wasteful number, since it uses less digits than its factorization.

78819765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5254659.

The product of its digits is 846720, while the sum is 51.

The square root of 78819765 is about 8878.0496168922. The cubic root of 78819765 is about 428.7574821543.

The spelling of 78819765 in words is "seventy-eight million, eight hundred nineteen thousand, seven hundred sixty-five".