32640251 has 4 divisors (see below), whose sum is σ = 37303152. Its totient is φ = 27977352.

The previous prime is 32640247. The next prime is 32640263. The reversal of 32640251 is 15204623.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15204623 = 7 ⋅2172089.

It is a cyclic number.

It is not a de Polignac number, because 32640251 - 2² = 32640247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (32640281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2331440 + ... + 2331453.

It is an arithmetic number, because the mean of its divisors is an integer number (9325788).

Almost surely, 2^32640251 is an apocalyptic number.

32640251 is a deficient number, since it is larger than the sum of its proper divisors (4662901).

32640251 is an equidigital number, since it uses as much as digits as its factorization.

32640251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4662900.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 32640251 is about 5713.1647096859. The cubic root of 32640251 is about 319.5836088081.

Adding to 32640251 its reverse (15204623), we get a palindrome (47844874).

The spelling of 32640251 in words is "thirty-two million, six hundred forty thousand, two hundred fifty-one".