28293977 has 8 divisors (see below), whose sum is σ = 29158920. Its totient is φ = 27437440.

The previous prime is 28293959. The next prime is 28294031. The reversal of 28293977 is 77939282.

It can be written as a sum of positive squares in 4 ways, for example, as 3083536 + 25210441 = 1756^2 + 5021^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 28293977 - 2⁸ = 28293721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28293077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5099 + ... + 9087.

It is an arithmetic number, because the mean of its divisors is an integer number (3644865).

Almost surely, 2^28293977 is an apocalyptic number.

It is an amenable number.

28293977 is a deficient number, since it is larger than the sum of its proper divisors (864943).

28293977 is a wasteful number, since it uses less digits than its factorization.

28293977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4203.

The product of its digits is 381024, while the sum is 47.

The square root of 28293977 is about 5319.2083057538. The cubic root of 28293977 is about 304.7179224867.

The spelling of 28293977 in words is "twenty-eight million, two hundred ninety-three thousand, nine hundred seventy-seven".