51322890 has 32 divisors (see below), whose sum is σ = 128532096. Its totient is φ = 13090880.

The previous prime is 51322889. The next prime is 51322897. The reversal of 51322890 is 9822315.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (51322897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36501 + ... + 37880.

It is an arithmetic number, because the mean of its divisors is an integer number (4016628).

Almost surely, 2^51322890 is an apocalyptic number.

51322890 is an abundant number, since it is smaller than the sum of its proper divisors (77209206).

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

51322890 is a wasteful number, since it uses less digits than its factorization.

51322890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74414.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 51322890 is about 7163.9995812395. Note that the first 3 decimals coincide. The cubic root of 51322890 is about 371.6239551777.

The spelling of 51322890 in words is "fifty-one million, three hundred twenty-two thousand, eight hundred ninety".