51494240 has 96 divisors (see below), whose sum is σ = 145152000. Its totient is φ = 16879104.

The previous prime is 51494239. The next prime is 51494291. The reversal of 51494240 is 4249415.

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, 24761 + ... + 26759.

It is an arithmetic number, because the mean of its divisors is an integer number (1512000).

Almost surely, 2^51494240 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 51494240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72576000).

51494240 is an abundant number, since it is smaller than the sum of its proper divisors (93657760).

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

51494240 is a wasteful number, since it uses less digits than its factorization.

51494240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2044 (or 2036 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 51494240 is about 7175.9487177655. The cubic root of 51494240 is about 372.0370718826.

The spelling of 51494240 in words is "fifty-one million, four hundred ninety-four thousand, two hundred forty".