75438640 has 20 divisors (see below), whose sum is σ = 175395024. Its totient is φ = 30175424.

The previous prime is 75438637. The next prime is 75438653. The reversal of 75438640 is 4683457.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 75438640.

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 3 ways as a sum of consecutive naturals, for example, 471412 + ... + 471571.

Almost surely, 2^75438640 is an apocalyptic number.

It is an amenable number.

75438640 is an abundant number, since it is smaller than the sum of its proper divisors (99956384).

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

75438640 is a wasteful number, since it uses less digits than its factorization.

75438640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942996 (or 942990 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 75438640 is about 8685.5420095697. The cubic root of 75438640 is about 422.5368757422.

The spelling of 75438640 in words is "seventy-five million, four hundred thirty-eight thousand, six hundred forty".