70021987 has 8 divisors (see below), whose sum is σ = 80818272. Its totient is φ = 59424000.

The previous prime is 70021951. The next prime is 70022003. The reversal of 70021987 is 78912007.

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

It is a cyclic number.

It is not a de Polignac number, because 70021987 - 2¹⁹ = 69497699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70021187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48814 + ... + 50227.

It is an arithmetic number, because the mean of its divisors is an integer number (10102284).

Almost surely, 2^70021987 is an apocalyptic number.

70021987 is a deficient number, since it is larger than the sum of its proper divisors (10796285).

70021987 is a wasteful number, since it uses less digits than its factorization.

70021987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99149.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 70021987 is about 8367.9141367488. The cubic root of 70021987 is about 412.1716753209.

The spelling of 70021987 in words is "seventy million, twenty-one thousand, nine hundred eighty-seven".