74634840 has 144 divisors (see below), whose sum is σ = 282232080. Its totient is φ = 17055360.

The previous prime is 74634787. The next prime is 74634853. The reversal of 74634840 is 4843647.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 74634795 and 74634804.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 15525 + ... + 19755.

It is an arithmetic number, because the mean of its divisors is an integer number (1959945).

Almost surely, 2^74634840 is an apocalyptic number.

74634840 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 74634840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141116040).

74634840 is an abundant number, since it is smaller than the sum of its proper divisors (207597240).

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

74634840 is a wasteful number, since it uses less digits than its factorization.

74634840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4262 (or 4248 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 36.

The square root of 74634840 is about 8639.1457911069. The cubic root of 74634840 is about 421.0308013792.

The spelling of 74634840 in words is "seventy-four million, six hundred thirty-four thousand, eight hundred forty".