690967680 has 512 divisors, whose sum is σ = 2632089600. Its totient is φ = 152616960.

The previous prime is 690967643. The next prime is 690967687. The reversal of 690967680 is 86769096.

It is a happy number.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (690967687) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14701417 + ... + 14701463.

It is an arithmetic number, because the mean of its divisors is an integer number (5140800).

Almost surely, 2^690967680 is an apocalyptic number.

690967680 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 690967680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1316044800).

690967680 is an abundant number, since it is smaller than the sum of its proper divisors (1941121920).

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

690967680 is a wasteful number, since it uses less digits than its factorization.

690967680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 51.

The square root of 690967680 is about 26286.2640936288. The cubic root of 690967680 is about 884.0684890597.

The spelling of 690967680 in words is "six hundred ninety million, nine hundred sixty-seven thousand, six hundred eighty".