870621987 has 4 divisors (see below), whose sum is σ = 1160829320. Its totient is φ = 580414656.

The previous prime is 870621979. The next prime is 870622033. The reversal of 870621987 is 789126078.

870621987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 870621987 - 2³ = 870621979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (870621907) 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, 145103662 + ... + 145103667.

It is an arithmetic number, because the mean of its divisors is an integer number (290207330).

Almost surely, 2^870621987 is an apocalyptic number.

870621987 is a deficient number, since it is larger than the sum of its proper divisors (290207333).

870621987 is a wasteful number, since it uses less digits than its factorization.

870621987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290207332.

The product of its (nonzero) digits is 338688, while the sum is 48.

The square root of 870621987 is about 29506.3041907996. The cubic root of 870621987 is about 954.8677162972.

The spelling of 870621987 in words is "eight hundred seventy million, six hundred twenty-one thousand, nine hundred eighty-seven".