87878847691 has 8 divisors (see below), whose sum is σ = 88645249440. Its totient is φ = 87114257088.

The previous prime is 87878847659. The next prime is 87878847739. The reversal of 87878847691 is 19674887878.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87878847691 - 2⁵ = 87878847659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87878847601) 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, 355231 + ... + 549496.

It is an arithmetic number, because the mean of its divisors is an integer number (11080656180).

Almost surely, 2^87878847691 is an apocalyptic number.

87878847691 is a deficient number, since it is larger than the sum of its proper divisors (766401749).

87878847691 is a wasteful number, since it uses less digits than its factorization.

87878847691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905573.

The product of its digits is 303464448, while the sum is 73.

The spelling of 87878847691 in words is "eighty-seven billion, eight hundred seventy-eight million, eight hundred forty-seven thousand, six hundred ninety-one".