28077890 has 8 divisors (see below), whose sum is σ = 50540220. Its totient is φ = 11231152.

The previous prime is 28077869. The next prime is 28077893. The reversal of 28077890 is 9877082.

It can be written as a sum of positive squares in 2 ways, for example, as 26739241 + 1338649 = 5171^2 + 1157^2 .

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

It is not an unprimeable number, because it can be changed into a prime (28077893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1403885 + ... + 1403904.

Almost surely, 2^28077890 is an apocalyptic number.

28077890 is a deficient number, since it is larger than the sum of its proper divisors (22462330).

28077890 is a wasteful number, since it uses less digits than its factorization.

28077890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2807796.

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 28077890 is about 5298.8574240113. The cubic root of 28077890 is about 303.9402078274.

The spelling of 28077890 in words is "twenty-eight million, seventy-seven thousand, eight hundred ninety".