64772765 has 4 divisors (see below), whose sum is σ = 77727324. Its totient is φ = 51818208.

The previous prime is 64772759. The next prime is 64772821. The reversal of 64772765 is 56727746.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56727746 = 2 ⋅28363873.

It can be written as a sum of positive squares in 2 ways, for example, as 14915044 + 49857721 = 3862^2 + 7061^2 .

It is a cyclic number.

It is not a de Polignac number, because 64772765 - 2¹⁴ = 64756381 is a prime.

It is a super-2 number, since 2×64772765² = 8391022171490450, which contains 22 as substring.

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, 6477272 + ... + 6477281.

It is an arithmetic number, because the mean of its divisors is an integer number (19431831).

Almost surely, 2^64772765 is an apocalyptic number.

It is an amenable number.

64772765 is a deficient number, since it is larger than the sum of its proper divisors (12954559).

64772765 is a wasteful number, since it uses less digits than its factorization.

64772765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12954558.

The product of its digits is 493920, while the sum is 44.

The square root of 64772765 is about 8048.1528936769. The cubic root of 64772765 is about 401.6034905393.

The spelling of 64772765 in words is "sixty-four million, seven hundred seventy-two thousand, seven hundred sixty-five".