90827789 has 4 divisors (see below), whose sum is σ = 97814556. Its totient is φ = 83841024.

The previous prime is 90827773. The next prime is 90827819. The reversal of 90827789 is 98772809.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14002564 + 76825225 = 3742^2 + 8765^2 .

It is a cyclic number.

It is not a de Polignac number, because 90827789 - 2⁴ = 90827773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90827089) 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, 3493364 + ... + 3493389.

It is an arithmetic number, because the mean of its divisors is an integer number (24453639).

Almost surely, 2^90827789 is an apocalyptic number.

It is an amenable number.

90827789 is a deficient number, since it is larger than the sum of its proper divisors (6986767).

90827789 is a wasteful number, since it uses less digits than its factorization.

90827789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6986766.

The product of its (nonzero) digits is 508032, while the sum is 50.

The square root of 90827789 is about 9530.3614307118. The cubic root of 90827789 is about 449.5102309266.

The spelling of 90827789 in words is "ninety million, eight hundred twenty-seven thousand, seven hundred eighty-nine".