28699649 has 4 divisors (see below), whose sum is σ = 31308720. Its totient is φ = 26090580.

The previous prime is 28699639. The next prime is 28699661. The reversal of 28699649 is 94699682.

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-28699649 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28699649.

It is not an unprimeable number, because it can be changed into a prime (28699639) 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, 1304519 + ... + 1304540.

It is an arithmetic number, because the mean of its divisors is an integer number (7827180).

Almost surely, 2^28699649 is an apocalyptic number.

It is an amenable number.

28699649 is a deficient number, since it is larger than the sum of its proper divisors (2609071).

28699649 is a wasteful number, since it uses less digits than its factorization.

28699649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2609070.

The product of its digits is 1679616, while the sum is 53.

The square root of 28699649 is about 5357.2053348738. The cubic root of 28699649 is about 306.1673405126.

The spelling of 28699649 in words is "twenty-eight million, six hundred ninety-nine thousand, six hundred forty-nine".