551859640 has 32 divisors (see below), whose sum is σ = 1245948480. Its totient is φ = 219985792.

The previous prime is 551859629. The next prime is 551859653. The reversal of 551859640 is 46958155.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11824 + ... + 35263.

It is an arithmetic number, because the mean of its divisors is an integer number (38935890).

Almost surely, 2^551859640 is an apocalyptic number.

It is an amenable number.

551859640 is an abundant number, since it is smaller than the sum of its proper divisors (694088840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

551859640 is a wasteful number, since it uses less digits than its factorization.

551859640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47391 (or 47387 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 43.

The square root of 551859640 is about 23491.6929998670. The cubic root of 551859640 is about 820.2436515690.

The spelling of 551859640 in words is "five hundred fifty-one million, eight hundred fifty-nine thousand, six hundred forty".