51667990 has 32 divisors (see below), whose sum is σ = 101930400. Its totient is φ = 18700800.

The previous prime is 51667969. The next prime is 51668003. The reversal of 51667990 is 9976615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25536 + ... + 27484.

It is an arithmetic number, because the mean of its divisors is an integer number (3185325).

Almost surely, 2^51667990 is an apocalyptic number.

51667990 is a deficient number, since it is larger than the sum of its proper divisors (50262410).

51667990 is a wasteful number, since it uses less digits than its factorization.

51667990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2208.

The product of its (nonzero) digits is 102060, while the sum is 43.

The square root of 51667990 is about 7188.0449358640. The cubic root of 51667990 is about 372.4550401422.

The spelling of 51667990 in words is "fifty-one million, six hundred sixty-seven thousand, nine hundred ninety".