87778031 has 4 divisors (see below), whose sum is σ = 95757864. Its totient is φ = 79798200.

The previous prime is 87778003. The next prime is 87778049. The reversal of 87778031 is 13087778.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87778031 - 2²⁶ = 20669167 is a prime.

It is a super-2 number, since 2×87778031² = 15409965452473922, which contains 22 as substring.

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 87778031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87778001) by changing a digit.

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, 3989900 + ... + 3989921.

It is an arithmetic number, because the mean of its divisors is an integer number (23939466).

Almost surely, 2^87778031 is an apocalyptic number.

87778031 is a deficient number, since it is larger than the sum of its proper divisors (7979833).

87778031 is a wasteful number, since it uses less digits than its factorization.

87778031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7979832.

The product of its (nonzero) digits is 65856, while the sum is 41.

The square root of 87778031 is about 9368.9930622239. The cubic root of 87778031 is about 444.4217224472.

The spelling of 87778031 in words is "eighty-seven million, seven hundred seventy-eight thousand, thirty-one".