28400619 has 32 divisors (see below), whose sum is σ = 42649600. Its totient is φ = 16791840.

The previous prime is 28400587. The next prime is 28400621. The reversal of 28400619 is 91600482.

It is not a de Polignac number, because 28400619 - 2⁵ = 28400587 is a prime.

It is a super-2 number, since 2×28400619² = 1613190319166322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28400219) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 204252 + ... + 204390.

It is an arithmetic number, because the mean of its divisors is an integer number (1332800).

Almost surely, 2^28400619 is an apocalyptic number.

28400619 is a deficient number, since it is larger than the sum of its proper divisors (14248981).

28400619 is a wasteful number, since it uses less digits than its factorization.

28400619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212 (or 186 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 28400619 is about 5329.2231141134. The cubic root of 28400619 is about 305.1002769801.

The spelling of 28400619 in words is "twenty-eight million, four hundred thousand, six hundred nineteen".