691075332 has 36 divisors (see below), whose sum is σ = 1749334860. Its totient is φ = 230035392.

The previous prime is 691075309. The next prime is 691075337. The reversal of 691075332 is 233570196.

It can be written as a sum of positive squares in 2 ways, for example, as 633830976 + 57244356 = 25176^2 + 7566^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×691075332² = 955170228997820448, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (691075337) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13294 + ... + 39482.

It is an arithmetic number, because the mean of its divisors is an integer number (48592635).

Almost surely, 2^691075332 is an apocalyptic number.

It is an amenable number.

691075332 is an abundant number, since it is smaller than the sum of its proper divisors (1058259528).

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

691075332 is a wasteful number, since it uses less digits than its factorization.

691075332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26932 (or 26927 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 36.

The square root of 691075332 is about 26288.3116993085. The cubic root of 691075332 is about 884.1143989730.

The spelling of 691075332 in words is "six hundred ninety-one million, seventy-five thousand, three hundred thirty-two".