75638491 has 4 divisors (see below), whose sum is σ = 80087832. Its totient is φ = 71189152.

The previous prime is 75638489. The next prime is 75638503. The reversal of 75638491 is 19483657.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 75638491 - 2¹ = 75638489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75638401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2224645 + ... + 2224678.

It is an arithmetic number, because the mean of its divisors is an integer number (20021958).

Almost surely, 2^75638491 is an apocalyptic number.

75638491 is a deficient number, since it is larger than the sum of its proper divisors (4449341).

75638491 is a wasteful number, since it uses less digits than its factorization.

75638491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4449340.

The product of its digits is 181440, while the sum is 43.

The square root of 75638491 is about 8697.0392088342. The cubic root of 75638491 is about 422.9096730118.

The spelling of 75638491 in words is "seventy-five million, six hundred thirty-eight thousand, four hundred ninety-one".