78288087 has 4 divisors (see below), whose sum is σ = 104384120. Its totient is φ = 52192056.

The previous prime is 78288083. The next prime is 78288101. The reversal of 78288087 is 78088287.

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

It is not a de Polignac number, because 78288087 - 2² = 78288083 is a prime.

It is a super-2 number, since 2×78288087² = 12258049132239138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78288083) 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, 13048012 + ... + 13048017.

It is an arithmetic number, because the mean of its divisors is an integer number (26096030).

Almost surely, 2^78288087 is an apocalyptic number.

78288087 is a deficient number, since it is larger than the sum of its proper divisors (26096033).

78288087 is a wasteful number, since it uses less digits than its factorization.

78288087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26096032.

The product of its (nonzero) digits is 401408, while the sum is 48.

The square root of 78288087 is about 8848.0555491023. The cubic root of 78288087 is about 427.7912464241.

The spelling of 78288087 in words is "seventy-eight million, two hundred eighty-eight thousand, eighty-seven".