51273250 has 64 divisors (see below), whose sum is σ = 111331584. Its totient is φ = 17318400.

The previous prime is 51273239. The next prime is 51273251. The reversal of 51273250 is 5237215.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (51273251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 145074 + ... + 145426.

It is an arithmetic number, because the mean of its divisors is an integer number (1739556).

Almost surely, 2^51273250 is an apocalyptic number.

51273250 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51273250 is an abundant number, since it is smaller than the sum of its proper divisors (60058334).

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

51273250 is a wasteful number, since it uses less digits than its factorization.

51273250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460 (or 450 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 51273250 is about 7160.5341979492. The cubic root of 51273250 is about 371.5041037570.

The spelling of 51273250 in words is "fifty-one million, two hundred seventy-three thousand, two hundred fifty".