51633440 has 24 divisors (see below), whose sum is σ = 121984380. Its totient is φ = 20653312.

The previous prime is 51633433. The next prime is 51633443. The reversal of 51633440 is 4433615.

It can be written as a sum of positive squares in 2 ways, for example, as 51208336 + 425104 = 7156^2 + 652^2 .

It is not an unprimeable number, because it can be changed into a prime (51633443) 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, 161195 + ... + 161514.

Almost surely, 2^51633440 is an apocalyptic number.

It is an amenable number.

51633440 is an abundant number, since it is smaller than the sum of its proper divisors (70350940).

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

51633440 is a wasteful number, since it uses less digits than its factorization.

51633440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322724 (or 322716 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 51633440 is about 7185.6412379133. The cubic root of 51633440 is about 372.3720023270.

The spelling of 51633440 in words is "fifty-one million, six hundred thirty-three thousand, four hundred forty".