51224390 has 64 divisors (see below), whose sum is σ = 109209600. Its totient is φ = 16937856.

The previous prime is 51224389. The next prime is 51224429. The reversal of 51224390 is 9342215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 326192 + ... + 326348.

It is an arithmetic number, because the mean of its divisors is an integer number (1706400).

Almost surely, 2^51224390 is an apocalyptic number.

51224390 is an abundant number, since it is smaller than the sum of its proper divisors (57985210).

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

51224390 is a wasteful number, since it uses less digits than its factorization.

51224390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 51224390 is about 7157.1216281407. The cubic root of 51224390 is about 371.3860600120.

The spelling of 51224390 in words is "fifty-one million, two hundred twenty-four thousand, three hundred ninety".