28780558 has 8 divisors (see below), whose sum is σ = 45710352. Its totient is φ = 13543776.

The previous prime is 28780547. The next prime is 28780559. The reversal of 28780558 is 85508782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×28780558³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28780559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 423210 + ... + 423277.

It is an arithmetic number, because the mean of its divisors is an integer number (5713794).

Almost surely, 2^28780558 is an apocalyptic number.

28780558 is a deficient number, since it is larger than the sum of its proper divisors (16929794).

28780558 is a wasteful number, since it uses less digits than its factorization.

28780558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846506.

The product of its (nonzero) digits is 179200, while the sum is 43.

The square root of 28780558 is about 5364.7514387901. The cubic root of 28780558 is about 306.4547824863.

The spelling of 28780558 in words is "twenty-eight million, seven hundred eighty thousand, five hundred fifty-eight".