74153840 has 80 divisors (see below), whose sum is σ = 181702656. Its totient is φ = 28089600.

The previous prime is 74153831. The next prime is 74153843. The reversal of 74153840 is 4835147.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 74153797 and 74153806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74153843) 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, 351335 + ... + 351545.

Almost surely, 2^74153840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 74153840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90851328).

74153840 is an abundant number, since it is smaller than the sum of its proper divisors (107548816).

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

74153840 is a wasteful number, since it uses less digits than its factorization.

74153840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438 (or 432 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 74153840 is about 8611.2623929364. The cubic root of 74153840 is about 420.1243773738.

Adding to 74153840 its reverse (4835147), we get a palindrome (78988987).

The spelling of 74153840 in words is "seventy-four million, one hundred fifty-three thousand, eight hundred forty".