51447040 has 36 divisors (see below), whose sum is σ = 123234804. Its totient is φ = 20578304.

The previous prime is 51447037. The next prime is 51447043. The reversal of 51447040 is 4074415.

It is an interprime number because it is at equal distance from previous prime (51447037) and next prime (51447043).

It can be written as a sum of positive squares in 2 ways, for example, as 14868736 + 36578304 = 3856^2 + 6048^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51446996 and 51447014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51447043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18817 + ... + 21376.

It is an arithmetic number, because the mean of its divisors is an integer number (3423189).

Almost surely, 2^51447040 is an apocalyptic number.

It is an amenable number.

51447040 is an abundant number, since it is smaller than the sum of its proper divisors (71787764).

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

51447040 is an equidigital number, since it uses as much as digits as its factorization.

51447040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40214 (or 40200 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 51447040 is about 7172.6592000457. The cubic root of 51447040 is about 371.9233664935.

The spelling of 51447040 in words is "fifty-one million, four hundred forty-seven thousand, forty".