87878409 has 8 divisors (see below), whose sum is σ = 117262752. Its totient is φ = 58539840.

The previous prime is 87878407. The next prime is 87878429. The reversal of 87878409 is 90487878.

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

It is not a de Polignac number, because 87878409 - 2¹ = 87878407 is a prime.

It is a super-2 number, since 2×87878409² = 15445229536742562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87878407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6679 + ... + 14844.

It is an arithmetic number, because the mean of its divisors is an integer number (14657844).

Almost surely, 2^87878409 is an apocalyptic number.

It is an amenable number.

87878409 is a deficient number, since it is larger than the sum of its proper divisors (29384343).

87878409 is a wasteful number, since it uses less digits than its factorization.

87878409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22887.

The product of its (nonzero) digits is 903168, while the sum is 51.

The square root of 87878409 is about 9374.3484573596. The cubic root of 87878409 is about 444.5910631102.

The spelling of 87878409 in words is "eighty-seven million, eight hundred seventy-eight thousand, four hundred nine".