70218987 has 16 divisors (see below), whose sum is σ = 95980032. Its totient is φ = 45643040.

The previous prime is 70218983. The next prime is 70218989. The reversal of 70218987 is 78981207.

It is a cyclic number.

It is not a de Polignac number, because 70218987 - 2² = 70218983 is a prime.

It is a super-2 number, since 2×70218987² = 9861412270612338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (70218983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43912 + ... + 45482.

It is an arithmetic number, because the mean of its divisors is an integer number (5998752).

Almost surely, 2^70218987 is an apocalyptic number.

70218987 is a deficient number, since it is larger than the sum of its proper divisors (25761045).

70218987 is a wasteful number, since it uses less digits than its factorization.

70218987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1938.

The product of its (nonzero) digits is 56448, while the sum is 42.

The square root of 70218987 is about 8379.6770224156. The cubic root of 70218987 is about 412.5578482691.

The spelling of 70218987 in words is "seventy million, two hundred eighteen thousand, nine hundred eighty-seven".