51256990 has 8 divisors (see below), whose sum is σ = 92262600. Its totient is φ = 20502792.

The previous prime is 51256979. The next prime is 51256991. The reversal of 51256990 is 9965215.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51256991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2562840 + ... + 2562859.

It is an arithmetic number, because the mean of its divisors is an integer number (11532825).

Almost surely, 2^51256990 is an apocalyptic number.

51256990 is a deficient number, since it is larger than the sum of its proper divisors (41005610).

51256990 is a wasteful number, since it uses less digits than its factorization.

51256990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5125706.

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 51256990 is about 7159.3987177695. The cubic root of 51256990 is about 371.4648285964.

The spelling of 51256990 in words is "fifty-one million, two hundred fifty-six thousand, nine hundred ninety".