28378779 has 32 divisors (see below), whose sum is σ = 45045504. Its totient is φ = 15665280.

The previous prime is 28378769. The next prime is 28378781. The reversal of 28378779 is 97787382.

It is not a de Polignac number, because 28378779 - 2⁸ = 28378523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28378709) 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, 35209 + ... + 36005.

It is an arithmetic number, because the mean of its divisors is an integer number (1407672).

Almost surely, 2^28378779 is an apocalyptic number.

28378779 is a deficient number, since it is larger than the sum of its proper divisors (16666725).

28378779 is a wasteful number, since it uses less digits than its factorization.

28378779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907.

The product of its digits is 1185408, while the sum is 51.

The square root of 28378779 is about 5327.1736408719. The cubic root of 28378779 is about 305.0220498257.

The spelling of 28378779 in words is "twenty-eight million, three hundred seventy-eight thousand, seven hundred seventy-nine".