51451040 has 24 divisors (see below), whose sum is σ = 121553460. Its totient is φ = 20580352.

The previous prime is 51451039. The next prime is 51451087. The reversal of 51451040 is 4015415.

It can be written as a sum of positive squares in 2 ways, for example, as 51437584 + 13456 = 7172^2 + 116^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160625 + ... + 160944.

Almost surely, 2^51451040 is an apocalyptic number.

It is an amenable number.

51451040 is an abundant number, since it is smaller than the sum of its proper divisors (70102420).

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

51451040 is a wasteful number, since it uses less digits than its factorization.

51451040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321584 (or 321576 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 51451040 is about 7172.9380312394. The cubic root of 51451040 is about 371.9330052399.

Adding to 51451040 its reverse (4015415), we get a palindrome (55466455).

The spelling of 51451040 in words is "fifty-one million, four hundred fifty-one thousand, forty".