231207690 has 64 divisors (see below), whose sum is σ = 644601600. Its totient is φ = 51978240.

The previous prime is 231207653. The next prime is 231207719. The reversal of 231207690 is 96702132.

It is a super-2 number, since 2×231207690² = 106913991830272200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3786 + ... + 21834.

It is an arithmetic number, because the mean of its divisors is an integer number (10071900).

Almost surely, 2^231207690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231207690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (322300800).

231207690 is an abundant number, since it is smaller than the sum of its proper divisors (413393910).

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

231207690 is a wasteful number, since it uses less digits than its factorization.

231207690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18127.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 231207690 is about 15205.5151178775. The cubic root of 231207690 is about 613.7630767232.

The spelling of 231207690 in words is "two hundred thirty-one million, two hundred seven thousand, six hundred ninety".