51653772 has 18 divisors (see below), whose sum is σ = 130569348. Its totient is φ = 17217912.

The previous prime is 51653743. The next prime is 51653773. The reversal of 51653772 is 27735615.

51653772 is a `hidden beast` number, since 51 + 6 + 537 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×51653772² = 5336224323655968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1434827 = 51653772 / (5 + 1 + 6 + 5 + 3 + 7 + 7 + 2).

It is not an unprimeable number, because it can be changed into a prime (51653773) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 717378 + ... + 717449.

Almost surely, 2^51653772 is an apocalyptic number.

It is an amenable number.

51653772 is an abundant number, since it is smaller than the sum of its proper divisors (78915576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51653772 is a wasteful number, since it uses less digits than its factorization.

51653772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1434837 (or 1434832 counting only the distinct ones).

The product of its digits is 44100, while the sum is 36.

The square root of 51653772 is about 7187.0558645387. The cubic root of 51653772 is about 372.4208729426.

It can be divided in two parts, 51653 and 772, that added together give a palindrome (52425).

The spelling of 51653772 in words is "fifty-one million, six hundred fifty-three thousand, seven hundred seventy-two".