51487400 has 24 divisors (see below), whose sum is σ = 119708670. Its totient is φ = 20594880.

The previous prime is 51487399. The next prime is 51487417. The reversal of 51487400 is 478415.

It can be written as a sum of positive squares in 3 ways, for example, as 39363076 + 12124324 = 6274^2 + 3482^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 128519 + ... + 128918.

Almost surely, 2^51487400 is an apocalyptic number.

51487400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51487400 is an abundant number, since it is smaller than the sum of its proper divisors (68221270).

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

51487400 is a wasteful number, since it uses less digits than its factorization.

51487400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257453 (or 257444 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 51487400 is about 7175.4721099033. The cubic root of 51487400 is about 372.0205985434.

The spelling of 51487400 in words is "fifty-one million, four hundred eighty-seven thousand, four hundred".