70641987 has 32 divisors (see below), whose sum is σ = 109734912. Its totient is φ = 40026624.

The previous prime is 70641983. The next prime is 70642001. The reversal of 70641987 is 78914607.

It is not a de Polignac number, because 70641987 - 2² = 70641983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (70641983) 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 31 ways as a sum of consecutive naturals, for example, 30028 + ... + 32294.

It is an arithmetic number, because the mean of its divisors is an integer number (3429216).

Almost surely, 2^70641987 is an apocalyptic number.

70641987 is a deficient number, since it is larger than the sum of its proper divisors (39092925).

70641987 is a wasteful number, since it uses less digits than its factorization.

70641987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2347.

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 70641987 is about 8404.8787617669. The cubic root of 70641987 is about 413.3846081176.

The spelling of 70641987 in words is "seventy million, six hundred forty-one thousand, nine hundred eighty-seven".