74231640 has 192 divisors, whose sum is σ = 286191360. Its totient is φ = 16951680.

The previous prime is 74231629. The next prime is 74231683. The reversal of 74231640 is 4613247.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 67495 + ... + 68585.

It is an arithmetic number, because the mean of its divisors is an integer number (1490580).

Almost surely, 2^74231640 is an apocalyptic number.

74231640 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 74231640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143095680).

74231640 is an abundant number, since it is smaller than the sum of its proper divisors (211959720).

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

74231640 is a wasteful number, since it uses less digits than its factorization.

74231640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124 (or 1108 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 74231640 is about 8615.7785486861. The cubic root of 74231640 is about 420.2712533471.

Adding to 74231640 its reverse (4613247), we get a palindrome (78844887).

The spelling of 74231640 in words is "seventy-four million, two hundred thirty-one thousand, six hundred forty".