87997005 has 12 divisors (see below), whose sum is σ = 152528220. Its totient is φ = 46931712.

The previous prime is 87997001. The next prime is 87997009. The reversal of 87997005 is 50079978.

It is an interprime number because it is at equal distance from previous prime (87997001) and next prime (87997009).

It can be written as a sum of positive squares in 2 ways, for example, as 37785609 + 50211396 = 6147^2 + 7086^2 .

It is not a de Polignac number, because 87997005 - 2² = 87997001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1955489 = 87997005 / (8 + 7 + 9 + 9 + 7 + 0 + 0 + 5).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87997001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 977700 + ... + 977789.

It is an arithmetic number, because the mean of its divisors is an integer number (12710685).

Almost surely, 2^87997005 is an apocalyptic number.

It is an amenable number.

87997005 is a deficient number, since it is larger than the sum of its proper divisors (64531215).

87997005 is a wasteful number, since it uses less digits than its factorization.

87997005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1955500 (or 1955497 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 45.

The square root of 87997005 is about 9380.6718842522. The cubic root of 87997005 is about 444.7909719806.

The spelling of 87997005 in words is "eighty-seven million, nine hundred ninety-seven thousand, five".