772381665 has 48 divisors (see below), whose sum is σ = 1481141376. Its totient is φ = 369196800.

The previous prime is 772381663. The next prime is 772381703. The reversal of 772381665 is 566183277.

772381665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 772381665 - 2¹ = 772381663 is a prime.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 772381665.

It is not an unprimeable number, because it can be changed into a prime (772381661) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24157 + ... + 46133.

It is an arithmetic number, because the mean of its divisors is an integer number (30857112).

Almost surely, 2^772381665 is an apocalyptic number.

It is an amenable number.

772381665 is a deficient number, since it is larger than the sum of its proper divisors (708759711).

772381665 is a wasteful number, since it uses less digits than its factorization.

772381665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22070 (or 22067 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 772381665 is about 27791.7553421874. The cubic root of 772381665 is about 917.5096737887.

The spelling of 772381665 in words is "seven hundred seventy-two million, three hundred eighty-one thousand, six hundred sixty-five".