87403691 has 4 divisors (see below), whose sum is σ = 89263392. Its totient is φ = 85543992.

The previous prime is 87403661. The next prime is 87403727. The reversal of 87403691 is 19630478.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87403691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87403621) 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, 929780 + ... + 929873.

It is an arithmetic number, because the mean of its divisors is an integer number (22315848).

Almost surely, 2^87403691 is an apocalyptic number.

87403691 is a deficient number, since it is larger than the sum of its proper divisors (1859701).

87403691 is a wasteful number, since it uses less digits than its factorization.

87403691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1859700.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 87403691 is about 9348.9941170160. The cubic root of 87403691 is about 443.7890588908.

The spelling of 87403691 in words is "eighty-seven million, four hundred three thousand, six hundred ninety-one".