28780326 has 32 divisors (see below), whose sum is σ = 67324800. Its totient is φ = 9088200.

The previous prime is 28780313. The next prime is 28780327. The reversal of 28780326 is 62308782.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28780327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13000 + ... + 15051.

It is an arithmetic number, because the mean of its divisors is an integer number (2103900).

Almost surely, 2^28780326 is an apocalyptic number.

28780326 is an abundant number, since it is smaller than the sum of its proper divisors (38544474).

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

28780326 is a wasteful number, since it uses less digits than its factorization.

28780326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28081 (or 28075 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 28780326 is about 5364.7298161231. The cubic root of 28780326 is about 306.4539590403.

The spelling of 28780326 in words is "twenty-eight million, seven hundred eighty thousand, three hundred twenty-six".