618456340 has 12 divisors (see below), whose sum is σ = 1298758356. Its totient is φ = 247382528.

The previous prime is 618456337. The next prime is 618456347. The reversal of 618456340 is 43654816.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 213802884 + 404653456 = 14622^2 + 20116^2 .

It is a super-3 number, since 3×618456340³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 618456340.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618456347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15461389 + ... + 15461428.

It is an arithmetic number, because the mean of its divisors is an integer number (108229863).

Almost surely, 2^618456340 is an apocalyptic number.

It is an amenable number.

618456340 is an abundant number, since it is smaller than the sum of its proper divisors (680302016).

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

618456340 is a wasteful number, since it uses less digits than its factorization.

618456340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30922826 (or 30922824 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 618456340 is about 24868.7824390339. The cubic root of 618456340 is about 851.9936318009.

The spelling of 618456340 in words is "six hundred eighteen million, four hundred fifty-six thousand, three hundred forty".