51669390 has 32 divisors (see below), whose sum is σ = 127360800. Its totient is φ = 13405824.

The previous prime is 51669383. The next prime is 51669421. The reversal of 51669390 is 9396615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22165 + ... + 24384.

It is an arithmetic number, because the mean of its divisors is an integer number (3980025).

Almost surely, 2^51669390 is an apocalyptic number.

51669390 is an abundant number, since it is smaller than the sum of its proper divisors (75691410).

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

51669390 is a wasteful number, since it uses less digits than its factorization.

51669390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46596.

The product of its (nonzero) digits is 43740, while the sum is 39.

The square root of 51669390 is about 7188.1423191253. The cubic root of 51669390 is about 372.4584041357.

The spelling of 51669390 in words is "fifty-one million, six hundred sixty-nine thousand, three hundred ninety".