691064240 has 40 divisors (see below), whose sum is σ = 1607830128. Its totient is φ = 276235520.

The previous prime is 691064239. The next prime is 691064261. The reversal of 691064240 is 42460196.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 691064197 and 691064206.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200774 + ... + 204186.

Almost surely, 2^691064240 is an apocalyptic number.

It is an amenable number.

691064240 is an abundant number, since it is smaller than the sum of its proper divisors (916765888).

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

691064240 is a wasteful number, since it uses less digits than its factorization.

691064240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5957 (or 5951 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 691064240 is about 26288.1007301783. The cubic root of 691064240 is about 884.1096688329.

The spelling of 691064240 in words is "six hundred ninety-one million, sixty-four thousand, two hundred forty".