51589640 has 32 divisors (see below), whose sum is σ = 116786880. Its totient is φ = 20509632.

The previous prime is 51589639. The next prime is 51589649. The reversal of 51589640 is 4698515.

It is a super-2 number, since 2×51589640² = 5322981910659200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51589594 and 51589603.

It is not an unprimeable number, because it can be changed into a prime (51589649) 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, 2819 + ... + 10541.

It is an arithmetic number, because the mean of its divisors is an integer number (3649590).

Almost surely, 2^51589640 is an apocalyptic number.

It is an amenable number.

51589640 is an abundant number, since it is smaller than the sum of its proper divisors (65197240).

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

51589640 is a wasteful number, since it uses less digits than its factorization.

51589640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7901 (or 7897 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 51589640 is about 7182.5928465979. The cubic root of 51589640 is about 372.2666797059.

The spelling of 51589640 in words is "fifty-one million, five hundred eighty-nine thousand, six hundred forty".