74531440 has 80 divisors (see below), whose sum is σ = 183488256. Its totient is φ = 28108800.

The previous prime is 74531437. The next prime is 74531449. The reversal of 74531440 is 4413547.

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 = 74531399 and 74531408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74531449) 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, 101314 + ... + 102046.

Almost surely, 2^74531440 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 74531440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91744128).

74531440 is an abundant number, since it is smaller than the sum of its proper divisors (108956816).

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

74531440 is a wasteful number, since it uses less digits than its factorization.

74531440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818 (or 812 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 74531440 is about 8633.1593290058. The cubic root of 74531440 is about 420.8362778171.

Adding to 74531440 its reverse (4413547), we get a palindrome (78944987).

The spelling of 74531440 in words is "seventy-four million, five hundred thirty-one thousand, four hundred forty".