51722765 has 8 divisors (see below), whose sum is σ = 63511008. Its totient is φ = 40415760.

The previous prime is 51722761. The next prime is 51722777. The reversal of 51722765 is 56722715.

It is a happy number.

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

It is not a de Polignac number, because 51722765 - 2² = 51722761 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51722761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120071 + ... + 120500.

It is an arithmetic number, because the mean of its divisors is an integer number (7938876).

Almost surely, 2^51722765 is an apocalyptic number.

It is an amenable number.

51722765 is a deficient number, since it is larger than the sum of its proper divisors (11788243).

51722765 is a wasteful number, since it uses less digits than its factorization.

51722765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240619.

The product of its digits is 29400, while the sum is 35.

The square root of 51722765 is about 7191.8540724906. The cubic root of 51722765 is about 372.5866110931.

The spelling of 51722765 in words is "fifty-one million, seven hundred twenty-two thousand, seven hundred sixty-five".