345721688 has 16 divisors (see below), whose sum is σ = 698092080. Its totient is φ = 159563808.

The previous prime is 345721669. The next prime is 345721697. The reversal of 345721688 is 886127543.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1662020 + ... + 1662227.

It is an arithmetic number, because the mean of its divisors is an integer number (43630755).

Almost surely, 2^345721688 is an apocalyptic number.

It is an amenable number.

345721688 is an abundant number, since it is smaller than the sum of its proper divisors (352370392).

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

345721688 is a wasteful number, since it uses less digits than its factorization.

345721688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3324266 (or 3324262 counting only the distinct ones).

The product of its digits is 322560, while the sum is 44.

The square root of 345721688 is about 18593.5926598385. The cubic root of 345721688 is about 701.8466127537.

The spelling of 345721688 in words is "three hundred forty-five million, seven hundred twenty-one thousand, six hundred eighty-eight".