51456140 has 24 divisors (see below), whose sum is σ = 108192672. Its totient is φ = 20556800.

The previous prime is 51456137. The next prime is 51456143. The reversal of 51456140 is 4165415.

It is an interprime number because it is at equal distance from previous prime (51456137) and next prime (51456143).

It is not an unprimeable number, because it can be changed into a prime (51456143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31217 + ... + 32823.

It is an arithmetic number, because the mean of its divisors is an integer number (4508028).

Almost surely, 2^51456140 is an apocalyptic number.

It is an amenable number.

51456140 is an abundant number, since it is smaller than the sum of its proper divisors (56736532).

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

51456140 is a wasteful number, since it uses less digits than its factorization.

51456140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3217 (or 3215 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 51456140 is about 7173.2935252923. The cubic root of 51456140 is about 371.9452939170.

The spelling of 51456140 in words is "fifty-one million, four hundred fifty-six thousand, one hundred forty".