691764480 has 432 divisors, whose sum is σ = 2686110336. Its totient is φ = 162938880.

The previous prime is 691764449. The next prime is 691764487. The reversal of 691764480 is 84467196.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691764487) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6716109 + ... + 6716211.

It is an arithmetic number, because the mean of its divisors is an integer number (6217848).

Almost surely, 2^691764480 is an apocalyptic number.

691764480 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 691764480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1343055168).

691764480 is an abundant number, since it is smaller than the sum of its proper divisors (1994345856).

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

691764480 is a wasteful number, since it uses less digits than its factorization.

691764480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 691764480 is about 26301.4159314665. The cubic root of 691764480 is about 884.4081842401.

The spelling of 691764480 in words is "six hundred ninety-one million, seven hundred sixty-four thousand, four hundred eighty".