70309840 has 20 divisors (see below), whose sum is σ = 163470564. Its totient is φ = 28123904.

The previous prime is 70309831. The next prime is 70309901. The reversal of 70309840 is 4890307.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 47499664 + 22810176 = 6892^2 + 4776^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439357 + ... + 439516.

Almost surely, 2^70309840 is an apocalyptic number.

It is an amenable number.

70309840 is an abundant number, since it is smaller than the sum of its proper divisors (93160724).

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

70309840 is a wasteful number, since it uses less digits than its factorization.

70309840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878886 (or 878880 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 70309840 is about 8385.0963023689. The cubic root of 70309840 is about 412.7357012305.

The spelling of 70309840 in words is "seventy million, three hundred nine thousand, eight hundred forty".