87747474778 has 8 divisors (see below), whose sum is σ = 131668788672. Its totient is φ = 43857878556.

The previous prime is 87747474769. The next prime is 87747474799.

87747474778 is nontrivially palindromic in base 10.

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

It is a super-2 number, since 2×87747474778² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7922500 + ... + 7933567.

It is an arithmetic number, because the mean of its divisors is an integer number (16458598584).

Almost surely, 2^87747474778 is an apocalyptic number.

87747474778 is a deficient number, since it is larger than the sum of its proper divisors (43921313894).

87747474778 is a wasteful number, since it uses less digits than its factorization.

87747474778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15858836.

The product of its digits is 481890304, while the sum is 70.

The spelling of 87747474778 in words is "eighty-seven billion, seven hundred forty-seven million, four hundred seventy-four thousand, seven hundred seventy-eight".