87523978 has 4 divisors (see below), whose sum is σ = 131285970. Its totient is φ = 43761988.

The previous prime is 87523949. The next prime is 87523999. The reversal of 87523978 is 87932578.

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., 87478609 + 45369 = 9353^2 + 213^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21880993 + ... + 21880996.

Almost surely, 2^87523978 is an apocalyptic number.

87523978 is a deficient number, since it is larger than the sum of its proper divisors (43761992).

87523978 is a wasteful number, since it uses less digits than its factorization.

87523978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43761991.

The product of its digits is 846720, while the sum is 49.

The square root of 87523978 is about 9355.4250571527. The cubic root of 87523978 is about 443.9925498574.

The spelling of 87523978 in words is "eighty-seven million, five hundred twenty-three thousand, nine hundred seventy-eight".