70217940 has 48 divisors (see below), whose sum is σ = 211736448. Its totient is φ = 17284224.

The previous prime is 70217933. The next prime is 70217947. The reversal of 70217940 is 4971207.

It is an interprime number because it is at equal distance from previous prime (70217933) and next prime (70217947).

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 70217898 and 70217907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70217947) 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 15 ways as a sum of consecutive naturals, for example, 44232 + ... + 45791.

It is an arithmetic number, because the mean of its divisors is an integer number (4411176).

Almost surely, 2^70217940 is an apocalyptic number.

It is an amenable number.

70217940 is an abundant number, since it is smaller than the sum of its proper divisors (141518508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

70217940 is a wasteful number, since it uses less digits than its factorization.

70217940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90048 (or 90046 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 70217940 is about 8379.6145496079. The cubic root of 70217940 is about 412.5557977780. Note that the first 3 decimals are identical.

The spelling of 70217940 in words is "seventy million, two hundred seventeen thousand, nine hundred forty".