699729978240 has 256 divisors, whose sum is σ = 2487371673600. Its totient is φ = 185904875520.

The previous prime is 699729978223. The next prime is 699729978247. The reversal of 699729978240 is 42879927996.

699729978240 is a `hidden beast` number, since 6 + 9 + 97 + 299 + 7 + 8 + 240 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (699729978247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4608169 + ... + 4757591.

It is an arithmetic number, because the mean of its divisors is an integer number (9716295600).

Almost surely, 2^699729978240 is an apocalyptic number.

699729978240 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 699729978240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1243685836800).

699729978240 is an abundant number, since it is smaller than the sum of its proper divisors (1787641695360).

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

699729978240 is a wasteful number, since it uses less digits than its factorization.

699729978240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149722 (or 149704 counting only the distinct ones).

The product of its (nonzero) digits is 246903552, while the sum is 72.

The spelling of 699729978240 in words is "six hundred ninety-nine billion, seven hundred twenty-nine million, nine hundred seventy-eight thousand, two hundred forty".