51722605 has 16 divisors (see below), whose sum is σ = 68387328. Its totient is φ = 37240000.

The previous prime is 51722597. The next prime is 51722611. The reversal of 51722605 is 50622715.

It is not a de Polignac number, because 51722605 - 2³ = 51722597 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 15 ways as a sum of consecutive naturals, for example, 900 + ... + 10210.

It is an arithmetic number, because the mean of its divisors is an integer number (4274208).

Almost surely, 2^51722605 is an apocalyptic number.

51722605 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51722605 is a deficient number, since it is larger than the sum of its proper divisors (16664723).

51722605 is a wasteful number, since it uses less digits than its factorization.

51722605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9428.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 51722605 is about 7191.8429487858. The cubic root of 51722605 is about 372.5862269043.

It can be divided in two parts, 5172 and 2605, that added together give a palindrome (7777).

The spelling of 51722605 in words is "fifty-one million, seven hundred twenty-two thousand, six hundred five".