697055009280 has 640 divisors, whose sum is σ = 2702739156480. Its totient is φ = 149610823680.

The previous prime is 697055009243. The next prime is 697055009309. The reversal of 697055009280 is 82900550796.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (640).

It is a super-2 number, since 2×697055009280² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 750327856 + ... + 750328784.

It is an arithmetic number, because the mean of its divisors is an integer number (4223029932).

Almost surely, 2^697055009280 is an apocalyptic number.

697055009280 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 697055009280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1351369578240).

697055009280 is an abundant number, since it is smaller than the sum of its proper divisors (2005684147200).

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

697055009280 is a wasteful number, since it uses less digits than its factorization.

697055009280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1800 (or 1784 counting only the distinct ones).

The product of its (nonzero) digits is 1360800, while the sum is 51.

The spelling of 697055009280 in words is "six hundred ninety-seven billion, fifty-five million, nine thousand, two hundred eighty".