263007990 has 144 divisors (see below), whose sum is σ = 830370528. Its totient is φ = 57480192.

The previous prime is 263007961. The next prime is 263007991. The reversal of 263007990 is 99700362.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263007991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 100134 + ... + 102726.

It is an arithmetic number, because the mean of its divisors is an integer number (5766462).

Almost surely, 2^263007990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 263007990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (415185264).

263007990 is an abundant number, since it is smaller than the sum of its proper divisors (567362538).

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

263007990 is a wasteful number, since it uses less digits than its factorization.

263007990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2643 (or 2633 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 263007990 is about 16217.5210806091. The cubic root of 263007990 is about 640.7023458150.

Subtracting from 263007990 its reverse (99700362), we obtain a triangular number (163307628 = T₁₈₀₇₂).

The spelling of 263007990 in words is "two hundred sixty-three million, seven thousand, nine hundred ninety".