51455772 has 36 divisors (see below), whose sum is σ = 130286520. Its totient is φ = 17123232.

The previous prime is 51455771. The next prime is 51455777. The reversal of 51455772 is 27755415.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51455771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41254 + ... + 42482.

It is an arithmetic number, because the mean of its divisors is an integer number (3619070).

Almost surely, 2^51455772 is an apocalyptic number.

It is an amenable number.

51455772 is an abundant number, since it is smaller than the sum of its proper divisors (78830748).

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

51455772 is a wasteful number, since it uses less digits than its factorization.

51455772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2402 (or 2397 counting only the distinct ones).

The product of its digits is 49000, while the sum is 36.

The square root of 51455772 is about 7173.2678745464. The cubic root of 51455772 is about 371.9444072318.

The spelling of 51455772 in words is "fifty-one million, four hundred fifty-five thousand, seven hundred seventy-two".