28691619 has 8 divisors (see below), whose sum is σ = 41733312. Its totient is φ = 17388840.

The previous prime is 28691617. The next prime is 28691629. The reversal of 28691619 is 91619682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28691619 - 2¹ = 28691617 is a prime.

It is a super-2 number, since 2×28691619² = 1646418001682322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28691617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 434689 + ... + 434754.

It is an arithmetic number, because the mean of its divisors is an integer number (5216664).

Almost surely, 2^28691619 is an apocalyptic number.

28691619 is a deficient number, since it is larger than the sum of its proper divisors (13041693).

28691619 is a wasteful number, since it uses less digits than its factorization.

28691619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869457.

The product of its digits is 46656, while the sum is 42.

The square root of 28691619 is about 5356.4558245168. The cubic root of 28691619 is about 306.1387832170.

The spelling of 28691619 in words is "twenty-eight million, six hundred ninety-one thousand, six hundred nineteen".