74472240 has 80 divisors (see below), whose sum is σ = 244457568. Its totient is φ = 18690048.

The previous prime is 74472197. The next prime is 74472247. The reversal of 74472240 is 4227447.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×74472240² = 11092229061235200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 74472198 and 74472207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74472247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5047 + ... + 13206.

Almost surely, 2^74472240 is an apocalyptic number.

It is an amenable number.

74472240 is an abundant number, since it is smaller than the sum of its proper divisors (169985328).

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

74472240 is a wasteful number, since it uses less digits than its factorization.

74472240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18286 (or 18280 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 30.

The square root of 74472240 is about 8629.7300073641. The cubic root of 74472240 is about 420.7248254922.

Adding to 74472240 its reverse (4227447), we get a palindrome (78699687).

The spelling of 74472240 in words is "seventy-four million, four hundred seventy-two thousand, two hundred forty".