51378880 has 56 divisors (see below), whose sum is σ = 139830048. Its totient is φ = 17614848.

The previous prime is 51378853. The next prime is 51378881. The reversal of 51378880 is 8887315.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (51378881) 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, 9229 + ... + 13708.

Almost surely, 2^51378880 is an apocalyptic number.

It is an amenable number.

51378880 is an abundant number, since it is smaller than the sum of its proper divisors (88451168).

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

51378880 is a wasteful number, since it uses less digits than its factorization.

51378880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22961 (or 22951 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 51378880 is about 7167.9062493869. The cubic root of 51378880 is about 371.7590454099.

The spelling of 51378880 in words is "fifty-one million, three hundred seventy-eight thousand, eight hundred eighty".