51206904 has 192 divisors, whose sum is σ = 169827840. Its totient is φ = 14152320.

The previous prime is 51206893. The next prime is 51206921. The reversal of 51206904 is 40960215.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 721189 + ... + 721259.

It is an arithmetic number, because the mean of its divisors is an integer number (884520).

Almost surely, 2^51206904 is an apocalyptic number.

51206904 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51206904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84913920).

51206904 is an abundant number, since it is smaller than the sum of its proper divisors (118620936).

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

51206904 is a wasteful number, since it uses less digits than its factorization.

51206904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 51206904 is about 7155.8999434033. The cubic root of 51206904 is about 371.3437963187.

The spelling of 51206904 in words is "fifty-one million, two hundred six thousand, nine hundred four".