51787879 has 32 divisors (see below), whose sum is σ = 63701568. Its totient is φ = 41817600.

The previous prime is 51787877. The next prime is 51787889. The reversal of 51787879 is 97878715.

51787879 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51787879 - 2¹ = 51787877 is a prime.

It is a super-2 number, since 2×51787879² = 5363968822637282, which contains 22 as substring.

It is a Duffinian number.

Its product of digits (987840) is a multiple of the sum of its prime factors (160).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51787873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 709387 + ... + 709459.

It is an arithmetic number, because the mean of its divisors is an integer number (1990674).

Almost surely, 2^51787879 is an apocalyptic number.

51787879 is a deficient number, since it is larger than the sum of its proper divisors (11913689).

51787879 is a wasteful number, since it uses less digits than its factorization.

51787879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160 (or 138 counting only the distinct ones).

The product of its digits is 987840, while the sum is 52.

The square root of 51787879 is about 7196.3795758701. The cubic root of 51787879 is about 372.7428957975.

The spelling of 51787879 in words is "fifty-one million, seven hundred eighty-seven thousand, eight hundred seventy-nine".