51449040 has 80 divisors (see below), whose sum is σ = 177220800. Its totient is φ = 13719168.

The previous prime is 51449039. The next prime is 51449051. The reversal of 51449040 is 4094415.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 51448995 and 51449013.

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, 9750 + ... + 14069.

It is an arithmetic number, because the mean of its divisors is an integer number (2215260).

Almost surely, 2^51449040 is an apocalyptic number.

It is an amenable number.

51449040 is an abundant number, since it is smaller than the sum of its proper divisors (125771760).

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

51449040 is a wasteful number, since it uses less digits than its factorization.

51449040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23841 (or 23829 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 51449040 is about 7172.7986169974. The cubic root of 51449040 is about 371.9281859292.

The spelling of 51449040 in words is "fifty-one million, four hundred forty-nine thousand, forty".