32640520 has 64 divisors (see below), whose sum is σ = 82736640. Its totient is φ = 11481600.

The previous prime is 32640481. The next prime is 32640529. The reversal of 32640520 is 2504623.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 32640491 and 32640500.

It is not an unprimeable number, because it can be changed into a prime (32640529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12444 + ... + 14836.

It is an arithmetic number, because the mean of its divisors is an integer number (1292760).

Almost surely, 2^32640520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 32640520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41368320).

32640520 is an abundant number, since it is smaller than the sum of its proper divisors (50096120).

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

32640520 is a wasteful number, since it uses less digits than its factorization.

32640520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2446 (or 2442 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 32640520 is about 5713.1882517558. The cubic root of 32640520 is about 319.5844867400.

The spelling of 32640520 in words is "thirty-two million, six hundred forty thousand, five hundred twenty".