70081640 has 32 divisors (see below), whose sum is σ = 158021280. Its totient is φ = 27972672.

The previous prime is 70081601. The next prime is 70081651. The reversal of 70081640 is 4618007.

It is a super-2 number, since 2×70081640² = 9822872530179200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20279 + ... + 23481.

It is an arithmetic number, because the mean of its divisors is an integer number (4938165).

Almost surely, 2^70081640 is an apocalyptic number.

It is an amenable number.

70081640 is an abundant number, since it is smaller than the sum of its proper divisors (87939640).

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

70081640 is a wasteful number, since it uses less digits than its factorization.

70081640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3761 (or 3757 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 70081640 is about 8371.4777667984. The cubic root of 70081640 is about 412.2886876061.

Adding to 70081640 its reverse (4618007), we get a palindrome (74699647).

The spelling of 70081640 in words is "seventy million, eighty-one thousand, six hundred forty".