698721340 has 24 divisors (see below), whose sum is σ = 1472511600. Its totient is φ = 278498688.

The previous prime is 698721329. The next prime is 698721343. The reversal of 698721340 is 43127896.

It is a junction number, because it is equal to n+sod(n) for n = 698721293 and 698721302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (698721343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56065 + ... + 67384.

It is an arithmetic number, because the mean of its divisors is an integer number (61354650).

Almost surely, 2^698721340 is an apocalyptic number.

It is an amenable number.

698721340 is an abundant number, since it is smaller than the sum of its proper divisors (773790260).

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

698721340 is a wasteful number, since it uses less digits than its factorization.

698721340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123741 (or 123739 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 698721340 is about 26433.3376628832. The cubic root of 698721340 is about 887.3630401627.

The spelling of 698721340 in words is "six hundred ninety-eight million, seven hundred twenty-one thousand, three hundred forty".