13773645 has 40 divisors (see below), whose sum is σ = 25090560. Its totient is φ = 7227360.

The previous prime is 13773629. The next prime is 13773647. The reversal of 13773645 is 54637731.

13773645 is a `hidden beast` number, since 1 + 3 + 7 + 7 + 3 + 645 = 666.

13773645 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13773645 - 2⁴ = 13773629 is a prime.

It is a super-3 number, since 3×13773645³ (a number of 22 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13773647) 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, 28516 + ... + 28994.

It is an arithmetic number, because the mean of its divisors is an integer number (627264).

Almost surely, 2^13773645 is an apocalyptic number.

13773645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13773645 is a deficient number, since it is larger than the sum of its proper divisors (11316915).

13773645 is an equidigital number, since it uses as much as digits as its factorization.

13773645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567 (or 558 counting only the distinct ones).

The product of its digits is 52920, while the sum is 36.

The square root of 13773645 is about 3711.2861651993. The cubic root of 13773645 is about 239.7082392089.

The spelling of 13773645 in words is "thirteen million, seven hundred seventy-three thousand, six hundred forty-five".