78650765 has 4 divisors (see below), whose sum is σ = 94380924. Its totient is φ = 62920608.

The previous prime is 78650753. The next prime is 78650771. The reversal of 78650765 is 56705687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56705687 = 739 ⋅76733.

It can be written as a sum of positive squares in 2 ways, for example, as 51423241 + 27227524 = 7171^2 + 5218^2 .

It is a cyclic number.

It is not a de Polignac number, because 78650765 - 2⁶ = 78650701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7865072 + ... + 7865081.

It is an arithmetic number, because the mean of its divisors is an integer number (23595231).

Almost surely, 2^78650765 is an apocalyptic number.

It is an amenable number.

78650765 is a deficient number, since it is larger than the sum of its proper divisors (15730159).

78650765 is a wasteful number, since it uses less digits than its factorization.

78650765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15730158.

The product of its (nonzero) digits is 352800, while the sum is 44.

The square root of 78650765 is about 8868.5266532835. The cubic root of 78650765 is about 428.4508252973.

The spelling of 78650765 in words is "seventy-eight million, six hundred fifty thousand, seven hundred sixty-five".