825999990 has 16 divisors (see below), whose sum is σ = 1982400048. Its totient is φ = 220266656.

The previous prime is 825999983. The next prime is 825999997. The reversal of 825999990 is 99999528.

It is an interprime number because it is at equal distance from previous prime (825999983) and next prime (825999997).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (825999997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13766637 + ... + 13766696.

It is an arithmetic number, because the mean of its divisors is an integer number (123900003).

Almost surely, 2^825999990 is an apocalyptic number.

825999990 is an abundant number, since it is smaller than the sum of its proper divisors (1156400058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

825999990 is a wasteful number, since it uses less digits than its factorization.

825999990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27533343.

The product of its (nonzero) digits is 4723920, while the sum is 60.

The square root of 825999990 is about 28740.2155524276. The cubic root of 825999990 is about 938.2675158315.

The spelling of 825999990 in words is "eight hundred twenty-five million, nine hundred ninety-nine thousand, nine hundred ninety".