51573390 has 64 divisors (see below), whose sum is σ = 136173312. Its totient is φ = 12396800.

The previous prime is 51573377. The next prime is 51573443. The reversal of 51573390 is 9337515.

51573390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

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, 42634 + ... + 43826.

It is an arithmetic number, because the mean of its divisors is an integer number (2127708).

Almost surely, 2^51573390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51573390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68086656).

51573390 is an abundant number, since it is smaller than the sum of its proper divisors (84599922).

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

51573390 is a wasteful number, since it uses less digits than its factorization.

51573390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1345.

The product of its (nonzero) digits is 14175, while the sum is 33.

The square root of 51573390 is about 7181.4615504088. The cubic root of 51573390 is about 372.2275893717.

The spelling of 51573390 in words is "fifty-one million, five hundred seventy-three thousand, three hundred ninety".