74135640 has 64 divisors (see below), whose sum is σ = 235496160. Its totient is φ = 18606080.

The previous prime is 74135639. The next prime is 74135641. The reversal of 74135640 is 4653147.

It is an interprime number because it is at equal distance from previous prime (74135639) and next prime (74135641).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 74135598 and 74135607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74135641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16131 + ... + 20210.

Almost surely, 2^74135640 is an apocalyptic number.

It is an amenable number.

74135640 is an abundant number, since it is smaller than the sum of its proper divisors (161360520).

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

74135640 is a wasteful number, since it uses less digits than its factorization.

74135640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36372 (or 36368 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 74135640 is about 8610.2055724588. The cubic root of 74135640 is about 420.0900033872.

Adding to 74135640 its reverse (4653147), we get a palindrome (78788787).

The spelling of 74135640 in words is "seventy-four million, one hundred thirty-five thousand, six hundred forty".