51403420432 has 80 divisors (see below), whose sum is σ = 124129277440. Its totient is φ = 20077963776.

The previous prime is 51403420399. The next prime is 51403420433. The reversal of 51403420432 is 23402430415.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 51403420432.

It is not an unprimeable number, because it can be changed into a prime (51403420433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108423 + ... + 338470.

It is an arithmetic number, because the mean of its divisors is an integer number (1551615968).

Almost surely, 2^51403420432 is an apocalyptic number.

51403420432 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

51403420432 is an abundant number, since it is smaller than the sum of its proper divisors (72725857008).

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

51403420432 is a wasteful number, since it uses less digits than its factorization.

51403420432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447000 (or 446994 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 51403420432 its reverse (23402430415), we get a palindrome (74805850847).

The spelling of 51403420432 in words is "fifty-one billion, four hundred three million, four hundred twenty thousand, four hundred thirty-two".