51403520 has 72 divisors (see below), whose sum is σ = 140741664. Its totient is φ = 17620992.

The previous prime is 51403519. The next prime is 51403537. The reversal of 51403520 is 2530415.

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

It is a junction number, because it is equal to n+sod(n) for n = 51403492 and 51403501.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6092 + ... + 11828.

Almost surely, 2^51403520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51403520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70370832).

51403520 is an abundant number, since it is smaller than the sum of its proper divisors (89338144).

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

51403520 is an equidigital number, since it uses as much as digits as its factorization.

51403520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5765 (or 5751 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 51403520 is about 7169.6248158464. The cubic root of 51403520 is about 371.8184646301.

Adding to 51403520 its reverse (2530415), we get a palindrome (53933935).

The spelling of 51403520 in words is "fifty-one million, four hundred three thousand, five hundred twenty".