87778007426 has 8 divisors (see below), whose sum is σ = 131671400700. Its totient is φ = 43887540528.

The previous prime is 87778007411. The next prime is 87778007477. The reversal of 87778007426 is 62470087778.

It can be written as a sum of positive squares in 2 ways, for example, as 86209768225 + 1568239201 = 293615^2 + 39601^2 .

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

It is a super-2 number, since 2×87778007426² (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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 655001 + ... + 777548.

Almost surely, 2^87778007426 is an apocalyptic number.

87778007426 is a deficient number, since it is larger than the sum of its proper divisors (43893393274).

87778007426 is a wasteful number, since it uses less digits than its factorization.

87778007426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463188.

The product of its (nonzero) digits is 7375872, while the sum is 56.

The spelling of 87778007426 in words is "eighty-seven billion, seven hundred seventy-eight million, seven thousand, four hundred twenty-six".