77706765 has 24 divisors (see below), whose sum is σ = 140549760. Its totient is φ = 39641184.

The previous prime is 77706763. The next prime is 77706781. The reversal of 77706765 is 56760777.

It is a happy number.

It is not a de Polignac number, because 77706765 - 2¹ = 77706763 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 77706765.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77706763) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36505 + ... + 38574.

It is an arithmetic number, because the mean of its divisors is an integer number (5856240).

Almost surely, 2^77706765 is an apocalyptic number.

It is an amenable number.

77706765 is a deficient number, since it is larger than the sum of its proper divisors (62842995).

77706765 is a wasteful number, since it uses less digits than its factorization.

77706765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75113 (or 75110 counting only the distinct ones).

The product of its (nonzero) digits is 432180, while the sum is 45.

The square root of 77706765 is about 8815.1440714262. The cubic root of 77706765 is about 426.7297714144.

It can be divided in two parts, 7770 and 6765, that added together give a triangular number (14535 = T₁₇₀).

The spelling of 77706765 in words is "seventy-seven million, seven hundred six thousand, seven hundred sixty-five".