231877791390 has 256 divisors, whose sum is σ = 667838545920. Its totient is φ = 50406935040.

The previous prime is 231877791347. The next prime is 231877791391. The reversal of 231877791390 is 93197778132.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 231877791390.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231877791391) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 318951207 + ... + 318951933.

It is an arithmetic number, because the mean of its divisors is an integer number (2608744320).

Almost surely, 2^231877791390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231877791390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (333919272960).

231877791390 is an abundant number, since it is smaller than the sum of its proper divisors (435960754530).

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

231877791390 is a wasteful number, since it uses less digits than its factorization.

231877791390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1487.

The product of its (nonzero) digits is 4000752, while the sum is 57.

The spelling of 231877791390 in words is "two hundred thirty-one billion, eight hundred seventy-seven million, seven hundred ninety-one thousand, three hundred ninety".