345238728 has 32 divisors (see below), whose sum is σ = 864988800. Its totient is φ = 114827328.

The previous prime is 345238697. The next prime is 345238741. The reversal of 345238728 is 827832543.

It is a super-2 number, since 2×345238728² = 238379558622115968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 345238728.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4423 + ... + 26646.

It is an arithmetic number, because the mean of its divisors is an integer number (27030900).

Almost surely, 2^345238728 is an apocalyptic number.

It is an amenable number.

345238728 is an abundant number, since it is smaller than the sum of its proper divisors (519750072).

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

345238728 is a wasteful number, since it uses less digits than its factorization.

345238728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31541 (or 31537 counting only the distinct ones).

The product of its digits is 322560, while the sum is 42.

The square root of 345238728 is about 18580.6008514257. The cubic root of 345238728 is about 701.5196428100.

The spelling of 345238728 in words is "three hundred forty-five million, two hundred thirty-eight thousand, seven hundred twenty-eight".