51280690 has 16 divisors (see below), whose sum is σ = 92860992. Its totient is φ = 20388784.

The previous prime is 51280681. The next prime is 51280693. The reversal of 51280690 is 9608215.

It is a super-2 number, since 2×51280690² = 5259418333752200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51280693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13684 + ... + 17023.

It is an arithmetic number, because the mean of its divisors is an integer number (5803812).

Almost surely, 2^51280690 is an apocalyptic number.

51280690 is a deficient number, since it is larger than the sum of its proper divisors (41580302).

51280690 is a wasteful number, since it uses less digits than its factorization.

51280690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30881.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 51280690 is about 7161.0536934169. The cubic root of 51280690 is about 371.5220719104.

The spelling of 51280690 in words is "fifty-one million, two hundred eighty thousand, six hundred ninety".