28687699 has 4 divisors (see below), whose sum is σ = 29676960. Its totient is φ = 27698440.

The previous prime is 28687697. The next prime is 28687717. The reversal of 28687699 is 99678682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99678682 = 2 ⋅49839341.

It is a cyclic number.

It is not a de Polignac number, because 28687699 - 2¹ = 28687697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28687697) 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, 494587 + ... + 494644.

It is an arithmetic number, because the mean of its divisors is an integer number (7419240).

Almost surely, 2^28687699 is an apocalyptic number.

28687699 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

28687699 is a deficient number, since it is larger than the sum of its proper divisors (989261).

28687699 is an equidigital number, since it uses as much as digits as its factorization.

28687699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989260.

The product of its digits is 2612736, while the sum is 55.

The square root of 28687699 is about 5356.0898984240. The cubic root of 28687699 is about 306.1248404847.

The spelling of 28687699 in words is "twenty-eight million, six hundred eighty-seven thousand, six hundred ninety-nine".