87765901 has 4 divisors (see below), whose sum is σ = 87891804. Its totient is φ = 87640000.

The previous prime is 87765893. The next prime is 87765911. The reversal of 87765901 is 10956778.

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

It can be written as a sum of positive squares in 2 ways, for example, as 57229225 + 30536676 = 7565^2 + 5526^2 .

It is a cyclic number.

It is not a de Polignac number, because 87765901 - 2³ = 87765893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87765911) 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, 61900 + ... + 63301.

It is an arithmetic number, because the mean of its divisors is an integer number (21972951).

Almost surely, 2^87765901 is an apocalyptic number.

It is an amenable number.

87765901 is a deficient number, since it is larger than the sum of its proper divisors (125903).

87765901 is a wasteful number, since it uses less digits than its factorization.

87765901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125902.

The product of its (nonzero) digits is 105840, while the sum is 43.

The square root of 87765901 is about 9368.3456917430. The cubic root of 87765901 is about 444.4012500360.

The spelling of 87765901 in words is "eighty-seven million, seven hundred sixty-five thousand, nine hundred one".