87557797 has 2 divisors, whose sum is σ = 87557798. Its totient is φ = 87557796.

The previous prime is 87557791. The next prime is 87557807. The reversal of 87557797 is 79775578.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55815841 + 31741956 = 7471^2 + 5634^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87557797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87557791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43778898 + 43778899.

It is an arithmetic number, because the mean of its divisors is an integer number (43778899).

Almost surely, 2^87557797 is an apocalyptic number.

It is an amenable number.

87557797 is a deficient number, since it is larger than the sum of its proper divisors (1).

87557797 is an equidigital number, since it uses as much as digits as its factorization.

87557797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4321800, while the sum is 55.

The square root of 87557797 is about 9357.2323365405. The cubic root of 87557797 is about 444.0497282857.

The spelling of 87557797 in words is "eighty-seven million, five hundred fifty-seven thousand, seven hundred ninety-seven".