51864252 has 24 divisors (see below), whose sum is σ = 132018432. Its totient is φ = 15716400.

The previous prime is 51864247. The next prime is 51864257. The reversal of 51864252 is 25246815.

It is an interprime number because it is at equal distance from previous prime (51864247) and next prime (51864257).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51864257) 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, 196324 + ... + 196587.

It is an arithmetic number, because the mean of its divisors is an integer number (5500768).

Almost surely, 2^51864252 is an apocalyptic number.

It is an amenable number.

51864252 is an abundant number, since it is smaller than the sum of its proper divisors (80154180).

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

51864252 is a wasteful number, since it uses less digits than its factorization.

51864252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392929 (or 392927 counting only the distinct ones).

The product of its digits is 19200, while the sum is 33.

The square root of 51864252 is about 7201.6839697393. The cubic root of 51864252 is about 372.9260371763.

The spelling of 51864252 in words is "fifty-one million, eight hundred sixty-four thousand, two hundred fifty-two".