691457380 has 12 divisors (see below), whose sum is σ = 1452060540. Its totient is φ = 276582944.

The previous prime is 691457363. The next prime is 691457381. The reversal of 691457380 is 83754196.

691457380 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 241678116 + 449779264 = 15546^2 + 21208^2 .

It is a super-4 number, since 4×691457380⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (691457381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17286415 + ... + 17286454.

It is an arithmetic number, because the mean of its divisors is an integer number (121005045).

Almost surely, 2^691457380 is an apocalyptic number.

It is an amenable number.

691457380 is an abundant number, since it is smaller than the sum of its proper divisors (760603160).

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

691457380 is a wasteful number, since it uses less digits than its factorization.

691457380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34572878 (or 34572876 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 691457380 is about 26295.5771946539. The cubic root of 691457380 is about 884.2772909653.

The spelling of 691457380 in words is "six hundred ninety-one million, four hundred fifty-seven thousand, three hundred eighty".