86870093978 has 16 divisors (see below), whose sum is σ = 134909659080. Its totient is φ = 41902679616.

The previous prime is 86870093977. The next prime is 86870094019. The reversal of 86870093978 is 87939007868.

It can be written as a sum of positive squares in 4 ways, for example, as 55782409489 + 31087684489 = 236183^2 + 176317^2 .

It is not an unprimeable number, because it can be changed into a prime (86870093977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 547025 + ... + 687732.

Almost surely, 2^86870093978 is an apocalyptic number.

86870093978 is a deficient number, since it is larger than the sum of its proper divisors (48039565102).

86870093978 is a wasteful number, since it uses less digits than its factorization.

86870093978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236001.

The product of its (nonzero) digits is 36578304, while the sum is 65.

The spelling of 86870093978 in words is "eighty-six billion, eight hundred seventy million, ninety-three thousand, nine hundred seventy-eight".