51807490 has 32 divisors (see below), whose sum is σ = 112187520. Its totient is φ = 16827264.

The previous prime is 51807473. The next prime is 51807499. The reversal of 51807490 is 9470815.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (51807499) 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, 18147 + ... + 20806.

It is an arithmetic number, because the mean of its divisors is an integer number (3505860).

Almost surely, 2^51807490 is an apocalyptic number.

51807490 is an abundant number, since it is smaller than the sum of its proper divisors (60380030).

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

51807490 is a wasteful number, since it uses less digits than its factorization.

51807490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38986.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 51807490 is about 7197.7420070464. The cubic root of 51807490 is about 372.7899398714.

The spelling of 51807490 in words is "fifty-one million, eight hundred seven thousand, four hundred ninety".