74224878 has 64 divisors (see below), whose sum is σ = 185525760. Its totient is φ = 19274112.

The previous prime is 74224859. The next prime is 74224879. The reversal of 74224878 is 87842247.

It is a super-2 number, since 2×74224878² = 11018665028229768, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74224879) 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, 35568 + ... + 37596.

It is an arithmetic number, because the mean of its divisors is an integer number (2898840).

Almost surely, 2^74224878 is an apocalyptic number.

74224878 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 74224878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92762880).

74224878 is an abundant number, since it is smaller than the sum of its proper divisors (111300882).

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

74224878 is a wasteful number, since it uses less digits than its factorization.

74224878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121.

The product of its digits is 200704, while the sum is 42.

The square root of 74224878 is about 8615.3861201922. The cubic root of 74224878 is about 420.2584916707.

The spelling of 74224878 in words is "seventy-four million, two hundred twenty-four thousand, eight hundred seventy-eight".