87394778 has 4 divisors (see below), whose sum is σ = 131092170. Its totient is φ = 43697388.

The previous prime is 87394771. The next prime is 87394789. The reversal of 87394778 is 87749378.

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., 86806489 + 588289 = 9317^2 + 767^2 .

It is not an unprimeable number, because it can be changed into a prime (87394771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21848693 + ... + 21848696.

Almost surely, 2^87394778 is an apocalyptic number.

87394778 is a deficient number, since it is larger than the sum of its proper divisors (43697392).

87394778 is a wasteful number, since it uses less digits than its factorization.

87394778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43697391.

The product of its digits is 2370816, while the sum is 53.

The square root of 87394778 is about 9348.5174225649. The cubic root of 87394778 is about 443.7739732337.

The spelling of 87394778 in words is "eighty-seven million, three hundred ninety-four thousand, seven hundred seventy-eight".