87736391 has 2 divisors, whose sum is σ = 87736392. Its totient is φ = 87736390.

The previous prime is 87736381. The next prime is 87736409. The reversal of 87736391 is 19363778.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87736391 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87736301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43868195 + 43868196.

It is an arithmetic number, because the mean of its divisors is an integer number (43868196).

Almost surely, 2^87736391 is an apocalyptic number.

87736391 is a deficient number, since it is larger than the sum of its proper divisors (1).

87736391 is an equidigital number, since it uses as much as digits as its factorization.

87736391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 44.

The square root of 87736391 is about 9366.7705747499. The cubic root of 87736391 is about 444.3514366466.

The spelling of 87736391 in words is "eighty-seven million, seven hundred thirty-six thousand, three hundred ninety-one".