51299424 has 72 divisors (see below), whose sum is σ = 159154632. Its totient is φ = 15544320.

The previous prime is 51299383. The next prime is 51299429. The reversal of 51299424 is 42499215.

It is a tau number, because it is divible by the number of its divisors (72).

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 (51299429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4929 + ... + 11264.

It is an arithmetic number, because the mean of its divisors is an integer number (2210481).

Almost surely, 2^51299424 is an apocalyptic number.

It is an amenable number.

51299424 is an abundant number, since it is smaller than the sum of its proper divisors (107855208).

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

51299424 is a wasteful number, since it uses less digits than its factorization.

51299424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16220 (or 16209 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 51299424 is about 7162.3616216999. The cubic root of 51299424 is about 371.5673082174.

The spelling of 51299424 in words is "fifty-one million, two hundred ninety-nine thousand, four hundred twenty-four".