1072321686 has 64 divisors (see below), whose sum is σ = 2510092800. Its totient is φ = 338662368.

The previous prime is 1072321681. The next prime is 1072321697. The reversal of 1072321686 is 6861232701.

It is a super-2 number, since 2×1072321686² = 2299747596531765192, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1072321686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1072321681) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 128860 + ... + 136928.

It is an arithmetic number, because the mean of its divisors is an integer number (39220200).

Almost surely, 2^1072321686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1072321686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1255046400).

1072321686 is an abundant number, since it is smaller than the sum of its proper divisors (1437771114).

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

1072321686 is a wasteful number, since it uses less digits than its factorization.

1072321686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8210 (or 8204 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 1072321686 is about 32746.3232439918. The cubic root of 1072321686 is about 1023.5483511114.

The spelling of 1072321686 in words is "one billion, seventy-two million, three hundred twenty-one thousand, six hundred eighty-six".