51820406 has 16 divisors (see below), whose sum is σ = 87533568. Its totient is φ = 22794600.

The previous prime is 51820399. The next prime is 51820411. The reversal of 51820406 is 60402815.

It is a congruent number.

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, 37310 + ... + 38673.

It is an arithmetic number, because the mean of its divisors is an integer number (5470848).

Almost surely, 2^51820406 is an apocalyptic number.

51820406 is a deficient number, since it is larger than the sum of its proper divisors (35713162).

51820406 is a wasteful number, since it uses less digits than its factorization.

51820406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76027.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 51820406 is about 7198.6391769556. The cubic root of 51820406 is about 372.8209170833.

The spelling of 51820406 in words is "fifty-one million, eight hundred twenty thousand, four hundred six".