987880805 has 8 divisors (see below), whose sum is σ = 1192007544. Its totient is φ = 785937600.

The previous prime is 987880801. The next prime is 987880847. The reversal of 987880805 is 508088789.

It can be written as a sum of positive squares in 4 ways, for example, as 95902849 + 891977956 = 9793^2 + 29866^2 .

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

It is not a de Polignac number, because 987880805 - 2² = 987880801 is a prime.

It is a house number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987880801) 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, 544886 + ... + 546695.

It is an arithmetic number, because the mean of its divisors is an integer number (149000943).

Almost surely, 2^987880805 is an apocalyptic number.

It is an amenable number.

987880805 is a deficient number, since it is larger than the sum of its proper divisors (204126739).

987880805 is a wasteful number, since it uses less digits than its factorization.

987880805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091767.

The product of its (nonzero) digits is 1290240, while the sum is 53.

The square root of 987880805 is about 31430.5711847558. The cubic root of 987880805 is about 995.9438381288.

The spelling of 987880805 in words is "nine hundred eighty-seven million, eight hundred eighty thousand, eight hundred five".