691900416 has 117 divisors (see below), whose sum is σ = 2013274081. Its totient is φ = 228950016.

The previous prime is 691900411. The next prime is 691900427. The reversal of 691900416 is 614009196.

The square root of 691900416 is 26304.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 406425600 + 285474816 = 20160^2 + 16896^2 .

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (691900411) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5050300 + ... + 5050436.

Almost surely, 2^691900416 is an apocalyptic number.

691900416 is the 26304-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 691900416

691900416 is an abundant number, since it is smaller than the sum of its proper divisors (1321373665).

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

691900416 is an equidigital number, since it uses as much as digits as its factorization.

691900416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The cubic root of 691900416 is about 884.4661110059.

Multiplying 691900416 by its sum of digits (36), we get a square (24908414976 = 157824²).

691900416 divided by its sum of digits (36) gives a square (19219456 = 4384²).

Multiplying 691900416 by its product of nonzero digits (11664), we get a square (8070326452224 = 2840832²).

The spelling of 691900416 in words is "six hundred ninety-one million, nine hundred thousand, four hundred sixteen".