51469440 has 128 divisors (see below), whose sum is σ = 179046720. Its totient is φ = 12472320.

The previous prime is 51469399. The next prime is 51469459. The reversal of 51469440 is 4496415.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-3 number, since 3×51469440³ (a number of 24 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19902 + ... + 22338.

Almost surely, 2^51469440 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 51469440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89523360).

51469440 is an abundant number, since it is smaller than the sum of its proper divisors (127577280).

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

51469440 is a wasteful number, since it uses less digits than its factorization.

51469440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2470 (or 2458 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 51469440 is about 7174.2205151501. The cubic root of 51469440 is about 371.9773370400.

The spelling of 51469440 in words is "fifty-one million, four hundred sixty-nine thousand, four hundred forty".