51646990 has 8 divisors (see below), whose sum is σ = 92964600. Its totient is φ = 20658792.

The previous prime is 51646951. The next prime is 51647009. The reversal of 51646990 is 9964615.

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

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, 2582340 + ... + 2582359.

It is an arithmetic number, because the mean of its divisors is an integer number (11620575).

Almost surely, 2^51646990 is an apocalyptic number.

51646990 is a deficient number, since it is larger than the sum of its proper divisors (41317610).

51646990 is a wasteful number, since it uses less digits than its factorization.

51646990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5164706.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 51646990 is about 7186.5840285911. The cubic root of 51646990 is about 372.4045729461.

The spelling of 51646990 in words is "fifty-one million, six hundred forty-six thousand, nine hundred ninety".