197061690 has 128 divisors (see below), whose sum is σ = 560609280. Its totient is φ = 43400448.

The previous prime is 197061653. The next prime is 197061691. The reversal of 197061690 is 96160791.

197061690 = 1121² + 1122² + ... + 1259².

It is a super-2 number, since 2×197061690² = 77666619331312200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (197061691) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1255092 + ... + 1255248.

It is an arithmetic number, because the mean of its divisors is an integer number (4379760).

Almost surely, 2^197061690 is an apocalyptic number.

197061690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 197061690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280304640).

197061690 is an abundant number, since it is smaller than the sum of its proper divisors (363547590).

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

197061690 is a wasteful number, since it uses less digits than its factorization.

197061690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356.

The product of its (nonzero) digits is 20412, while the sum is 39.

The square root of 197061690 is about 14037.8662908577. The cubic root of 197061690 is about 581.9255168555.

The spelling of 197061690 in words is "one hundred ninety-seven million, sixty-one thousand, six hundred ninety".