28420699 has 4 divisors (see below), whose sum is σ = 29188864. Its totient is φ = 27652536.

The previous prime is 28420673. The next prime is 28420723. The reversal of 28420699 is 99602482.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28420699 - 2¹¹ = 28418651 is a prime.

It is a super-2 number, since 2×28420699² = 1615472263297202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28420619) 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, 384027 + ... + 384100.

It is an arithmetic number, because the mean of its divisors is an integer number (7297216).

Almost surely, 2^28420699 is an apocalyptic number.

28420699 is a deficient number, since it is larger than the sum of its proper divisors (768165).

28420699 is an equidigital number, since it uses as much as digits as its factorization.

28420699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768164.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 28420699 is about 5331.1067331277. The cubic root of 28420699 is about 305.1721647359.

The spelling of 28420699 in words is "twenty-eight million, four hundred twenty thousand, six hundred ninety-nine".