70806640 has 20 divisors (see below), whose sum is σ = 164625624. Its totient is φ = 28322624.

The previous prime is 70806613. The next prime is 70806653. The reversal of 70806640 is 4660807.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 442462 + ... + 442621.

Almost surely, 2^70806640 is an apocalyptic number.

It is an amenable number.

70806640 is an abundant number, since it is smaller than the sum of its proper divisors (93818984).

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

70806640 is a wasteful number, since it uses less digits than its factorization.

70806640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885096 (or 885090 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 70806640 is about 8414.6681455658. The cubic root of 70806640 is about 413.7055324712.

The spelling of 70806640 in words is "seventy million, eight hundred six thousand, six hundred forty".