51990474 has 16 divisors (see below), whose sum is σ = 104061312. Its totient is φ = 17316768.

The previous prime is 51990473. The next prime is 51990481. The reversal of 51990474 is 47409915.

It is not an unprimeable number, because it can be changed into a prime (51990473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8047 + ... + 12989.

It is an arithmetic number, because the mean of its divisors is an integer number (6503832).

Almost surely, 2^51990474 is an apocalyptic number.

51990474 is an abundant number, since it is smaller than the sum of its proper divisors (52070838).

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

51990474 is a wasteful number, since it uses less digits than its factorization.

51990474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6701.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 51990474 is about 7210.4420114165. The cubic root of 51990474 is about 373.2283220454.

The spelling of 51990474 in words is "fifty-one million, nine hundred ninety thousand, four hundred seventy-four".