32640557 has 4 divisors (see below), whose sum is σ = 32784576. Its totient is φ = 32496540.

The previous prime is 32640529. The next prime is 32640581. The reversal of 32640557 is 75504623.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75504623 = 31 ⋅2435633.

It is a cyclic number.

It is not a de Polignac number, because 32640557 - 2⁸ = 32640301 is a prime.

It is a super-2 number, since 2×32640557² = 2130811922540498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32643557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71669 + ... + 72122.

It is an arithmetic number, because the mean of its divisors is an integer number (8196144).

Almost surely, 2^32640557 is an apocalyptic number.

It is an amenable number.

32640557 is a deficient number, since it is larger than the sum of its proper divisors (144019).

32640557 is a wasteful number, since it uses less digits than its factorization.

32640557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144018.

The product of its (nonzero) digits is 25200, while the sum is 32.

The square root of 32640557 is about 5713.1914898767. The cubic root of 32640557 is about 319.5846074960.

The spelling of 32640557 in words is "thirty-two million, six hundred forty thousand, five hundred fifty-seven".