828791087 has 4 divisors (see below), whose sum is σ = 857370120. Its totient is φ = 800212056.

The previous prime is 828791081. The next prime is 828791101. The reversal of 828791087 is 780197828.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 828791087 - 2⁴ = 828791071 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 (828791081) 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, 14289473 + ... + 14289530.

It is an arithmetic number, because the mean of its divisors is an integer number (214342530).

Almost surely, 2^828791087 is an apocalyptic number.

828791087 is a deficient number, since it is larger than the sum of its proper divisors (28579033).

828791087 is a wasteful number, since it uses less digits than its factorization.

828791087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28579032.

The product of its (nonzero) digits is 451584, while the sum is 50.

The square root of 828791087 is about 28788.7319449815. The cubic root of 828791087 is about 939.3231459860.

The spelling of 828791087 in words is "eight hundred twenty-eight million, seven hundred ninety-one thousand, eighty-seven".