4581640 has 32 divisors (see below), whose sum is σ = 11782080. Its totient is φ = 1570752.

The previous prime is 4581637. The next prime is 4581659. The reversal of 4581640 is 461854.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 4581599 and 4581608.

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, 7902 + ... + 8461.

It is an arithmetic number, because the mean of its divisors is an integer number (368190).

Almost surely, 2^4581640 is an apocalyptic number.

4581640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4581640 is an abundant number, since it is smaller than the sum of its proper divisors (7200440).

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

4581640 is a wasteful number, since it uses less digits than its factorization.

4581640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16381 (or 16377 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 4581640 is about 2140.4765824461. The cubic root of 4581640 is about 166.0887897766.

The spelling of 4581640 in words is "four million, five hundred eighty-one thousand, six hundred forty".