87856738 has 4 divisors (see below), whose sum is σ = 131785110. Its totient is φ = 43928368.

The previous prime is 87856733. The next prime is 87856763. The reversal of 87856738 is 83765878.

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

It can be written as a sum of positive squares in only one way, i.e., 87665769 + 190969 = 9363^2 + 437^2 .

It is not an unprimeable number, because it can be changed into a prime (87856733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21964183 + ... + 21964186.

Almost surely, 2^87856738 is an apocalyptic number.

87856738 is a deficient number, since it is larger than the sum of its proper divisors (43928372).

87856738 is a wasteful number, since it uses less digits than its factorization.

87856738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43928371.

The product of its digits is 2257920, while the sum is 52.

The square root of 87856738 is about 9373.1925190940. The cubic root of 87856738 is about 444.5545144094.

The spelling of 87856738 in words is "eighty-seven million, eight hundred fifty-six thousand, seven hundred thirty-eight".