51438153240 has 96 divisors (see below), whose sum is σ = 177007783680. Its totient is φ = 12909966336.

The previous prime is 51438153233. The next prime is 51438153251. The reversal of 51438153240 is 4235183415.

51438153240 is a `hidden beast` number, since 5 + 1 + 4 + 3 + 81 + 532 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 51438153195 and 51438153204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4196344 + ... + 4208583.

It is an arithmetic number, because the mean of its divisors is an integer number (1843831080).

Almost surely, 2^51438153240 is an apocalyptic number.

It is an amenable number.

51438153240 is an abundant number, since it is smaller than the sum of its proper divisors (125569630440).

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

51438153240 is a wasteful number, since it uses less digits than its factorization.

51438153240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8404961 (or 8404954 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The spelling of 51438153240 in words is "fifty-one billion, four hundred thirty-eight million, one hundred fifty-three thousand, two hundred forty".