135723645 has 24 divisors (see below), whose sum is σ = 236500992. Its totient is φ = 72002400.

The previous prime is 135723641. The next prime is 135723647. The reversal of 135723645 is 546327531.

135723645 is a `hidden beast` number, since 1 + 3 + 5 + 7 + 2 + 3 + 645 = 666.

It is not a de Polignac number, because 135723645 - 2² = 135723641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135723641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 700 + ... + 16490.

It is an arithmetic number, because the mean of its divisors is an integer number (9854208).

Almost surely, 2^135723645 is an apocalyptic number.

135723645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

135723645 is a deficient number, since it is larger than the sum of its proper divisors (100777347).

135723645 is a wasteful number, since it uses less digits than its factorization.

135723645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15993 (or 15990 counting only the distinct ones).

The product of its digits is 75600, while the sum is 36.

The square root of 135723645 is about 11650.0491415273. The cubic root of 135723645 is about 513.9077552016.

The spelling of 135723645 in words is "one hundred thirty-five million, seven hundred twenty-three thousand, six hundred forty-five".