87747474779 has 8 divisors (see below), whose sum is σ = 88945717680. Its totient is φ = 86555692000.

The previous prime is 87747474769. The next prime is 87747474799. The reversal of 87747474779 is 97747474778.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87747474779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87747474769) 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, 1587677 + ... + 1642014.

It is an arithmetic number, because the mean of its divisors is an integer number (11118214710).

Almost surely, 2^87747474779 is an apocalyptic number.

87747474779 is a deficient number, since it is larger than the sum of its proper divisors (1198242901).

87747474779 is a wasteful number, since it uses less digits than its factorization.

87747474779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3230061.

The product of its digits is 542126592, while the sum is 71.

Subtracting 87747474779 from its reverse (97747474778), we obtain a palindrome (9999999999).

The spelling of 87747474779 in words is "eighty-seven billion, seven hundred forty-seven million, four hundred seventy-four thousand, seven hundred seventy-nine".