1690891290 has 96 divisors (see below), whose sum is σ = 4804240896. Its totient is φ = 409207680.

The previous prime is 1690891289. The next prime is 1690891309. The reversal of 1690891290 is 921980961.

It is a super-2 number, since 2×1690891290² = 5718226709195728200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 787959 + ... + 790101.

It is an arithmetic number, because the mean of its divisors is an integer number (50044176).

Almost surely, 2^1690891290 is an apocalyptic number.

1690891290 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 1690891290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2402120448).

1690891290 is an abundant number, since it is smaller than the sum of its proper divisors (3113349606).

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

1690891290 is a wasteful number, since it uses less digits than its factorization.

1690891290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2964 (or 2961 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 45.

The square root of 1690891290 is about 41120.4485627285. The cubic root of 1690891290 is about 1191.3477867718.

The spelling of 1690891290 in words is "one billion, six hundred ninety million, eight hundred ninety-one thousand, two hundred ninety".