51639854 has 8 divisors (see below), whose sum is σ = 88525488. Its totient is φ = 22131360.

The previous prime is 51639839. The next prime is 51639877. The reversal of 51639854 is 45893615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×51639854² = 5333349042282632, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1844267 + ... + 1844294.

It is an arithmetic number, because the mean of its divisors is an integer number (11065686).

Almost surely, 2^51639854 is an apocalyptic number.

51639854 is a deficient number, since it is larger than the sum of its proper divisors (36885634).

51639854 is a wasteful number, since it uses less digits than its factorization.

51639854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3688570.

The product of its digits is 129600, while the sum is 41.

The square root of 51639854 is about 7186.0875307778. The cubic root of 51639854 is about 372.3874205981.

The spelling of 51639854 in words is "fifty-one million, six hundred thirty-nine thousand, eight hundred fifty-four".