51423750 has 120 divisors (see below), whose sum is σ = 159361488. Its totient is φ = 11736000.

The previous prime is 51423733. The next prime is 51423763. The reversal of 51423750 is 5732415.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 78424 + ... + 79076.

Almost surely, 2^51423750 is an apocalyptic number.

51423750 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51423750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79680744).

51423750 is an abundant number, since it is smaller than the sum of its proper divisors (107937738).

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

51423750 is a wasteful number, since it uses less digits than its factorization.

51423750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688 (or 670 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 51423750 is about 7171.0354900809. The cubic root of 51423750 is about 371.8672349672.

It can be divided in two parts, 51 and 423750, that added together give a square (423801 = 651²).

The spelling of 51423750 in words is "fifty-one million, four hundred twenty-three thousand, seven hundred fifty".