691530156 has 72 divisors (see below), whose sum is σ = 1892289840. Its totient is φ = 218365632.

The previous prime is 691530109. The next prime is 691530173. The reversal of 691530156 is 651035196.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 691530156.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30120 + ... + 47856.

Almost surely, 2^691530156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 691530156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (946144920).

691530156 is an abundant number, since it is smaller than the sum of its proper divisors (1200759684).

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

691530156 is a wasteful number, since it uses less digits than its factorization.

691530156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17788 (or 17761 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 691530156 is about 26296.9609651001. The cubic root of 691530156 is about 884.3083133191.

The spelling of 691530156 in words is "six hundred ninety-one million, five hundred thirty thousand, one hundred fifty-six".