51553864 has 8 divisors (see below), whose sum is σ = 96663510. Its totient is φ = 25776928.

The previous prime is 51553829. The next prime is 51553889. The reversal of 51553864 is 46835515.

It can be written as a sum of positive squares in only one way, i.e., 44488900 + 7064964 = 6670^2 + 2658^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3222109 + ... + 3222124.

Almost surely, 2^51553864 is an apocalyptic number.

It is an amenable number.

51553864 is a deficient number, since it is larger than the sum of its proper divisors (45109646).

51553864 is a wasteful number, since it uses less digits than its factorization.

51553864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6444239 (or 6444235 counting only the distinct ones).

The product of its digits is 72000, while the sum is 37.

The square root of 51553864 is about 7180.1019491369. The cubic root of 51553864 is about 372.1806075635.

The spelling of 51553864 in words is "fifty-one million, five hundred fifty-three thousand, eight hundred sixty-four".