74387840 has 64 divisors (see below), whose sum is σ = 181690560. Its totient is φ = 29110272.

The previous prime is 74387809. The next prime is 74387843. The reversal of 74387840 is 4878347.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74387843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28844 + ... + 31316.

It is an arithmetic number, because the mean of its divisors is an integer number (2838915).

Almost surely, 2^74387840 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 74387840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90845280).

74387840 is an abundant number, since it is smaller than the sum of its proper divisors (107302720).

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

74387840 is a wasteful number, since it uses less digits than its factorization.

74387840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2539 (or 2527 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 41.

The square root of 74387840 is about 8624.8385492135. The cubic root of 74387840 is about 420.5658284485.

The spelling of 74387840 in words is "seventy-four million, three hundred eighty-seven thousand, eight hundred forty".