74571640 has 64 divisors (see below), whose sum is σ = 197134560. Its totient is φ = 25029120.

The previous prime is 74571631. The next prime is 74571641. The reversal of 74571640 is 4617547.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 74571596 and 74571605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74571641) 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, 799 + ... + 12238.

Almost surely, 2^74571640 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 74571640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98567280).

74571640 is an abundant number, since it is smaller than the sum of its proper divisors (122562920).

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

74571640 is a wasteful number, since it uses less digits than its factorization.

74571640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13072 (or 13068 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 74571640 is about 8635.4872473995. The cubic root of 74571640 is about 420.9119263294.

The spelling of 74571640 in words is "seventy-four million, five hundred seventy-one thousand, six hundred forty".