28770641 has 4 divisors (see below), whose sum is σ = 28947312. Its totient is φ = 28593972.

The previous prime is 28770611. The next prime is 28770649. The reversal of 28770641 is 14607782.

It is a happy number.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28770641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28770649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88091 + ... + 88416.

It is an arithmetic number, because the mean of its divisors is an integer number (7236828).

Almost surely, 2^28770641 is an apocalyptic number.

It is an amenable number.

28770641 is a deficient number, since it is larger than the sum of its proper divisors (176671).

28770641 is a wasteful number, since it uses less digits than its factorization.

28770641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176670.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 28770641 is about 5363.8270852070. The cubic root of 28770641 is about 306.4195797728.

The spelling of 28770641 in words is "twenty-eight million, seven hundred seventy thousand, six hundred forty-one".