75172440 has 64 divisors (see below), whose sum is σ = 257736960. Its totient is φ = 17182080.

The previous prime is 75172423. The next prime is 75172463. The reversal of 75172440 is 4427157.

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 = 75172398 and 75172407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43906 + ... + 45585.

It is an arithmetic number, because the mean of its divisors is an integer number (4027140).

Almost surely, 2^75172440 is an apocalyptic number.

75172440 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

75172440 is an abundant number, since it is smaller than the sum of its proper divisors (182564520).

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

75172440 is a wasteful number, since it uses less digits than its factorization.

75172440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89512 (or 89508 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 30.

The square root of 75172440 is about 8670.2041498456. The cubic root of 75172440 is about 422.0392886610.

Adding to 75172440 its reverse (4427157), we get a palindrome (79599597).

The spelling of 75172440 in words is "seventy-five million, one hundred seventy-two thousand, four hundred forty".