691083456 has 336 divisors, whose sum is σ = 2345436000. Its totient is φ = 178225152.

The previous prime is 691083443. The next prime is 691083517. The reversal of 691083456 is 654380196.

It is a tau number, because it is divible by the number of its divisors (336).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4638070 + ... + 4638218.

Almost surely, 2^691083456 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 691083456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1172718000).

691083456 is an abundant number, since it is smaller than the sum of its proper divisors (1654352544).

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

691083456 is a wasteful number, since it uses less digits than its factorization.

691083456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 691083456 is about 26288.4662161945. The cubic root of 691083456 is about 884.1178633889.

The spelling of 691083456 in words is "six hundred ninety-one million, eighty-three thousand, four hundred fifty-six".