813691488 has 48 divisors (see below), whose sum is σ = 2145407040. Its totient is φ = 270028416.

The previous prime is 813691477. The next prime is 813691499. The reversal of 813691488 is 884196318.

It is an interprime number because it is at equal distance from previous prime (813691477) and next prime (813691499).

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3123 + ... + 40461.

It is an arithmetic number, because the mean of its divisors is an integer number (44695980).

Almost surely, 2^813691488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 813691488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1072703520).

813691488 is an abundant number, since it is smaller than the sum of its proper divisors (1331715552).

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

813691488 is a wasteful number, since it uses less digits than its factorization.

813691488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37579 (or 37571 counting only the distinct ones).

The product of its digits is 331776, while the sum is 48.

The square root of 813691488 is about 28525.2780529831. The cubic root of 813691488 is about 933.5836938342.

The spelling of 813691488 in words is "eight hundred thirteen million, six hundred ninety-one thousand, four hundred eighty-eight".