87778733394 has 16 divisors (see below), whose sum is σ = 191517236640. Its totient is φ = 26599616160.

The previous prime is 87778733359. The next prime is 87778733407. The reversal of 87778733394 is 49333787778.

It is a super-3 number, since 3×87778733394³ (a number of 34 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66), and also a Moran number because the ratio is a prime number: 1329980809 = 87778733394 / (8 + 7 + 7 + 7 + 8 + 7 + 3 + 3 + 3 + 9 + 4).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 664990339 + ... + 664990470.

It is an arithmetic number, because the mean of its divisors is an integer number (11969827290).

Almost surely, 2^87778733394 is an apocalyptic number.

87778733394 is an abundant number, since it is smaller than the sum of its proper divisors (103738503246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87778733394 is a wasteful number, since it uses less digits than its factorization.

87778733394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1329980825.

The product of its digits is 149361408, while the sum is 66.

The spelling of 87778733394 in words is "eighty-seven billion, seven hundred seventy-eight million, seven hundred thirty-three thousand, three hundred ninety-four".