1061868820 has 12 divisors (see below), whose sum is σ = 2229924564. Its totient is φ = 424747520.

The previous prime is 1061868817. The next prime is 1061868851. The reversal of 1061868820 is 288681601.

It can be written as a sum of positive squares in 2 ways, for example, as 701932036 + 359936784 = 26494^2 + 18972^2 .

It is a super-2 number, since 2×1061868820² = 2255130781776384800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26546701 + ... + 26546740.

It is an arithmetic number, because the mean of its divisors is an integer number (185827047).

Almost surely, 2^1061868820 is an apocalyptic number.

1061868820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1061868820 is an abundant number, since it is smaller than the sum of its proper divisors (1168055744).

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

1061868820 is a wasteful number, since it uses less digits than its factorization.

1061868820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53093450 (or 53093448 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 1061868820 is about 32586.3287284714. The cubic root of 1061868820 is about 1020.2116759202.

The spelling of 1061868820 in words is "one billion, sixty-one million, eight hundred sixty-eight thousand, eight hundred twenty".