87249671691 has 16 divisors (see below), whose sum is σ = 143178948864. Its totient is φ = 46021804704.

The previous prime is 87249671687. The next prime is 87249671731. The reversal of 87249671691 is 19617694278.

It is not a de Polignac number, because 87249671691 - 2² = 87249671687 is a prime.

It is a super-2 number, since 2×87249671691² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87249671681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159797661 + ... + 159798206.

It is an arithmetic number, because the mean of its divisors is an integer number (8948684304).

Almost surely, 2^87249671691 is an apocalyptic number.

87249671691 is a deficient number, since it is larger than the sum of its proper divisors (55929277173).

87249671691 is a wasteful number, since it uses less digits than its factorization.

87249671691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319595890.

The product of its digits is 9144576, while the sum is 60.

The spelling of 87249671691 in words is "eighty-seven billion, two hundred forty-nine million, six hundred seventy-one thousand, six hundred ninety-one".