87979977441 has 20 divisors (see below), whose sum is σ = 134483324272. Its totient is φ = 57289285368.

The previous prime is 87979977431. The next prime is 87979977539. The reversal of 87979977441 is 14477997978.

It is a happy number.

87979977441 is a `hidden beast` number, since 8 + 7 + 97 + 9 + 97 + 7 + 441 = 666.

It is not a de Polignac number, because 87979977441 - 2⁵ = 87979977409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87979977441.

It is not an unprimeable number, because it can be changed into a prime (87979977401) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12626431 + ... + 12633396.

Almost surely, 2^87979977441 is an apocalyptic number.

87979977441 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

87979977441 is a deficient number, since it is larger than the sum of its proper divisors (46503346831).

87979977441 is a wasteful number, since it uses less digits than its factorization.

87979977441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25259882 (or 25259873 counting only the distinct ones).

The product of its digits is 224042112, while the sum is 72.

The spelling of 87979977441 in words is "eighty-seven billion, nine hundred seventy-nine million, nine hundred seventy-seven thousand, four hundred forty-one".