3728641 has 4 divisors (see below), whose sum is σ = 4261312. Its totient is φ = 3195972.

The previous prime is 3728633. The next prime is 3728671. The reversal of 3728641 is 1468273.

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: 1468273 = 17 ⋅86369.

It is a cyclic number.

It is not a de Polignac number, because 3728641 - 2³ = 3728633 is a prime.

It is a Duffinian number.

3728641 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3728611) 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, 266325 + ... + 266338.

It is an arithmetic number, because the mean of its divisors is an integer number (1065328).

Almost surely, 2^3728641 is an apocalyptic number.

It is an amenable number.

3728641 is a deficient number, since it is larger than the sum of its proper divisors (532671).

3728641 is an equidigital number, since it uses as much as digits as its factorization.

3728641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532670.

The product of its digits is 8064, while the sum is 31.

The square root of 3728641 is about 1930.9689277666. The cubic root of 3728641 is about 155.0660973734.

The spelling of 3728641 in words is "three million, seven hundred twenty-eight thousand, six hundred forty-one".