201990690 has 96 divisors (see below), whose sum is σ = 575505216. Its totient is φ = 48746880.

The previous prime is 201990683. The next prime is 201990697. The reversal of 201990690 is 96099102.

It is an interprime number because it is at equal distance from previous prime (201990683) and next prime (201990697).

It is a super-2 number, since 2×201990690² = 81600477693352200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (201990697) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 368997 + ... + 369543.

It is an arithmetic number, because the mean of its divisors is an integer number (5994846).

Almost surely, 2^201990690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201990690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (287752608).

201990690 is an abundant number, since it is smaller than the sum of its proper divisors (373514526).

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

201990690 is a wasteful number, since it uses less digits than its factorization.

201990690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 944 (or 941 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 201990690 is about 14212.3428751209. The cubic root of 201990690 is about 586.7374164991.

The spelling of 201990690 in words is "two hundred one million, nine hundred ninety thousand, six hundred ninety".