51378978 has 16 divisors (see below), whose sum is σ = 117437760. Its totient is φ = 14679696.

The previous prime is 51378967. The next prime is 51379061. The reversal of 51378978 is 87987315.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 611613 + ... + 611696.

It is an arithmetic number, because the mean of its divisors is an integer number (7339860).

Almost surely, 2^51378978 is an apocalyptic number.

51378978 is an abundant number, since it is smaller than the sum of its proper divisors (66058782).

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

51378978 is a wasteful number, since it uses less digits than its factorization.

51378978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1223321.

The product of its digits is 423360, while the sum is 48.

The square root of 51378978 is about 7167.9130854106. The cubic root of 51378978 is about 371.7592817740.

The spelling of 51378978 in words is "fifty-one million, three hundred seventy-eight thousand, nine hundred seventy-eight".