1345749228 has 120 divisors (see below), whose sum is σ = 3688312320. Its totient is φ = 427062240.

The previous prime is 1345749221. The next prime is 1345749239. The reversal of 1345749228 is 8229475431.

1345749228 is a `hidden beast` number, since 134 + 5 + 7 + 492 + 28 = 666.

It is a super-2 number, since 2×1345749228² = 3622081969325191968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1345749221) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3122173 + ... + 3122603.

It is an arithmetic number, because the mean of its divisors is an integer number (30735936).

Almost surely, 2^1345749228 is an apocalyptic number.

1345749228 is a gapful number since it is divisible by the number (18) 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 1345749228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1844156160).

1345749228 is an abundant number, since it is smaller than the sum of its proper divisors (2342563092).

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

1345749228 is a wasteful number, since it uses less digits than its factorization.

1345749228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889 (or 878 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 1345749228 is about 36684.4548548837. The cubic root of 1345749228 is about 1104.0482315885.

The spelling of 1345749228 in words is "one billion, three hundred forty-five million, seven hundred forty-nine thousand, two hundred twenty-eight".