75491887 has 2 divisors, whose sum is σ = 75491888. Its totient is φ = 75491886.

The previous prime is 75491863. The next prime is 75491909. The reversal of 75491887 is 78819457.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 75491887 - 2¹⁵ = 75459119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 75491887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75491287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37745943 + 37745944.

It is an arithmetic number, because the mean of its divisors is an integer number (37745944).

Almost surely, 2^75491887 is an apocalyptic number.

75491887 is a deficient number, since it is larger than the sum of its proper divisors (1).

75491887 is an equidigital number, since it uses as much as digits as its factorization.

75491887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 564480, while the sum is 49.

The square root of 75491887 is about 8688.6067352597. The cubic root of 75491887 is about 422.6362656996.

The spelling of 75491887 in words is "seventy-five million, four hundred ninety-one thousand, eight hundred eighty-seven".