75791987 has 2 divisors, whose sum is σ = 75791988. Its totient is φ = 75791986.

The previous prime is 75791983. The next prime is 75791999. The reversal of 75791987 is 78919757.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 75791987 - 2² = 75791983 is a prime.

It is not a weakly prime, because it can be changed into another prime (75791983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37895993 + 37895994.

It is an arithmetic number, because the mean of its divisors is an integer number (37895994).

Almost surely, 2^75791987 is an apocalyptic number.

75791987 is a deficient number, since it is larger than the sum of its proper divisors (1).

75791987 is an equidigital number, since it uses as much as digits as its factorization.

75791987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1111320, while the sum is 53.

The square root of 75791987 is about 8705.8593487375. The cubic root of 75791987 is about 423.1955551525.

The spelling of 75791987 in words is "seventy-five million, seven hundred ninety-one thousand, nine hundred eighty-seven".