51306632 has 16 divisors (see below), whose sum is σ = 103600140. Its totient is φ = 23679936.

The previous prime is 51306623. The next prime is 51306649. The reversal of 51306632 is 23660315.

It can be written as a sum of positive squares in 2 ways, for example, as 49928356 + 1378276 = 7066^2 + 1174^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

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, 246563 + ... + 246770.

Almost surely, 2^51306632 is an apocalyptic number.

51306632 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

51306632 is an abundant number, since it is smaller than the sum of its proper divisors (52293508).

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

51306632 is a wasteful number, since it uses less digits than its factorization.

51306632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493352 (or 493348 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 51306632 is about 7162.8647900124. The cubic root of 51306632 is about 371.5847101784.

Adding to 51306632 its reverse (23660315), we get a palindrome (74966947).

The spelling of 51306632 in words is "fifty-one million, three hundred six thousand, six hundred thirty-two".