690288206520 has 256 divisors, whose sum is σ = 2327634247680. Its totient is φ = 162315161600.

The previous prime is 690288206519. The next prime is 690288206677. The reversal of 690288206520 is 25602882096.

It is a self number, because there is not a number n which added to its sum of digits gives 690288206520.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9325897 + ... + 9399623.

It is an arithmetic number, because the mean of its divisors is an integer number (9092321280).

Almost surely, 2^690288206520 is an apocalyptic number.

690288206520 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 690288206520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1163817123840).

690288206520 is an abundant number, since it is smaller than the sum of its proper divisors (1637346041160).

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

690288206520 is a wasteful number, since it uses less digits than its factorization.

690288206520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73966 (or 73962 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 48.

The spelling of 690288206520 in words is "six hundred ninety billion, two hundred eighty-eight million, two hundred six thousand, five hundred twenty".