70609728 has 112 divisors (see below), whose sum is σ = 215944704. Its totient is φ = 19944960.

The previous prime is 70609709. The next prime is 70609739. The reversal of 70609728 is 82790607.

It is a tau number, because it is divible by the number of its divisors (112).

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 15 ways as a sum of consecutive naturals, for example, 143563 + ... + 144053.

Almost surely, 2^70609728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70609728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107972352).

70609728 is an abundant number, since it is smaller than the sum of its proper divisors (145334976).

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

70609728 is a wasteful number, since it uses less digits than its factorization.

70609728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620 (or 610 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 70609728 is about 8402.9594786599. The cubic root of 70609728 is about 413.3216738531.

The spelling of 70609728 in words is "seventy million, six hundred nine thousand, seven hundred twenty-eight".