28719405 has 48 divisors (see below), whose sum is σ = 58496256. Its totient is φ = 12850560.

The previous prime is 28719389. The next prime is 28719407. The reversal of 28719405 is 50491782.

It is not a de Polignac number, because 28719405 - 2⁴ = 28719389 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28719405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28719407) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4204 + ... + 8666.

It is an arithmetic number, because the mean of its divisors is an integer number (1218672).

Almost surely, 2^28719405 is an apocalyptic number.

It is an amenable number.

28719405 is an abundant number, since it is smaller than the sum of its proper divisors (29776851).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28719405 is a wasteful number, since it uses less digits than its factorization.

28719405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4498 (or 4495 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 28719405 is about 5359.0488894952. The cubic root of 28719405 is about 306.2375766167.

The spelling of 28719405 in words is "twenty-eight million, seven hundred nineteen thousand, four hundred five".