74172120 has 128 divisors (see below), whose sum is σ = 246032640. Its totient is φ = 17738240.

The previous prime is 74172107. The next prime is 74172127. The reversal of 74172120 is 2127147.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74172127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 109222 + ... + 109898.

It is an arithmetic number, because the mean of its divisors is an integer number (1922130).

Almost surely, 2^74172120 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 74172120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123016320).

74172120 is an abundant number, since it is smaller than the sum of its proper divisors (171860520).

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

74172120 is a wasteful number, since it uses less digits than its factorization.

74172120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785 (or 781 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 74172120 is about 8612.3237282397. The cubic root of 74172120 is about 420.1588967938.

Adding to 74172120 its reverse (2127147), we get a palindrome (76299267).

The spelling of 74172120 in words is "seventy-four million, one hundred seventy-two thousand, one hundred twenty".