87091957 has 4 divisors (see below), whose sum is σ = 88519756. Its totient is φ = 85664160.

The previous prime is 87091943. The next prime is 87091973. The reversal of 87091957 is 75919078.

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 8964036 + 78127921 = 2994^2 + 8839^2 .

It is a cyclic number.

It is not a de Polignac number, because 87091957 - 2¹¹ = 87089909 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 (87091157) 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, 713808 + ... + 713929.

It is an arithmetic number, because the mean of its divisors is an integer number (22129939).

Almost surely, 2^87091957 is an apocalyptic number.

It is an amenable number.

87091957 is a deficient number, since it is larger than the sum of its proper divisors (1427799).

87091957 is a wasteful number, since it uses less digits than its factorization.

87091957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1427798.

The product of its (nonzero) digits is 158760, while the sum is 46.

The square root of 87091957 is about 9332.3071638261. The cubic root of 87091957 is about 443.2608243800.

The spelling of 87091957 in words is "eighty-seven million, ninety-one thousand, nine hundred fifty-seven".