51687830 has 16 divisors (see below), whose sum is σ = 93386304. Its totient is φ = 20597760.

The previous prime is 51687821. The next prime is 51687851. The reversal of 51687830 is 3878615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6827 + ... + 12246.

It is an arithmetic number, because the mean of its divisors is an integer number (5836644).

Almost surely, 2^51687830 is an apocalyptic number.

51687830 is a deficient number, since it is larger than the sum of its proper divisors (41698474).

51687830 is a wasteful number, since it uses less digits than its factorization.

51687830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19351.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 51687830 is about 7189.4248726863. The cubic root of 51687830 is about 372.5027070656.

The spelling of 51687830 in words is "fifty-one million, six hundred eighty-seven thousand, eight hundred thirty".