87778079 has 4 divisors (see below), whose sum is σ = 87987000. Its totient is φ = 87569160.

The previous prime is 87778073. The next prime is 87778087. The reversal of 87778079 is 97087778.

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 87778079 - 2¹⁶ = 87712543 is a prime.

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 87778079.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87778073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103829 + ... + 104670.

It is an arithmetic number, because the mean of its divisors is an integer number (21996750).

Almost surely, 2^87778079 is an apocalyptic number.

87778079 is a deficient number, since it is larger than the sum of its proper divisors (208921).

87778079 is a wasteful number, since it uses less digits than its factorization.

87778079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208920.

The product of its (nonzero) digits is 1382976, while the sum is 53.

The square root of 87778079 is about 9368.9956238649. The cubic root of 87778079 is about 444.4218034554.

The spelling of 87778079 in words is "eighty-seven million, seven hundred seventy-eight thousand, seventy-nine".