78987141 has 6 divisors (see below), whose sum is σ = 114092550. Its totient is φ = 52658088.

The previous prime is 78987137. The next prime is 78987143. The reversal of 78987141 is 14178987.

It can be written as a sum of positive squares in only one way, i.e., 70308225 + 8678916 = 8385^2 + 2946^2 .

It is not a de Polignac number, because 78987141 - 2² = 78987137 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78987143) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4388166 + ... + 4388183.

It is an arithmetic number, because the mean of its divisors is an integer number (19015425).

Almost surely, 2^78987141 is an apocalyptic number.

It is an amenable number.

78987141 is a deficient number, since it is larger than the sum of its proper divisors (35105409).

78987141 is a wasteful number, since it uses less digits than its factorization.

78987141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8776355 (or 8776352 counting only the distinct ones).

The product of its digits is 112896, while the sum is 45.

The square root of 78987141 is about 8887.4710126110. The cubic root of 78987141 is about 429.0607604617.

The spelling of 78987141 in words is "seventy-eight million, nine hundred eighty-seven thousand, one hundred forty-one".