87649632691 has 8 divisors (see below), whose sum is σ = 89025267344. Its totient is φ = 86275981440.

The previous prime is 87649632671. The next prime is 87649632793. The reversal of 87649632691 is 19623694678.

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 87649632691 - 2¹³ = 87649624499 is a prime.

It is a super-2 number, since 2×87649632691² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87649632601) 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, 406650 + ... + 583663.

It is an arithmetic number, because the mean of its divisors is an integer number (11128158418).

Almost surely, 2^87649632691 is an apocalyptic number.

87649632691 is a deficient number, since it is larger than the sum of its proper divisors (1375634653).

87649632691 is a wasteful number, since it uses less digits than its factorization.

87649632691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991701.

The product of its digits is 23514624, while the sum is 61.

The spelling of 87649632691 in words is "eighty-seven billion, six hundred forty-nine million, six hundred thirty-two thousand, six hundred ninety-one".