28780723 has 2 divisors, whose sum is σ = 28780724. Its totient is φ = 28780722.

The previous prime is 28780693. The next prime is 28780733. The reversal of 28780723 is 32708782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28780723 - 2²¹ = 26683571 is a prime.

It is not a weakly prime, because it can be changed into another prime (28780733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14390361 + 14390362.

It is an arithmetic number, because the mean of its divisors is an integer number (14390362).

Almost surely, 2^28780723 is an apocalyptic number.

28780723 is a deficient number, since it is larger than the sum of its proper divisors (1).

28780723 is an equidigital number, since it uses as much as digits as its factorization.

28780723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 28780723 is about 5364.7668169269. The cubic root of 28780723 is about 306.4553681240.

The spelling of 28780723 in words is "twenty-eight million, seven hundred eighty thousand, seven hundred twenty-three".