70649856 has 72 divisors (see below), whose sum is σ = 204102990. Its totient is φ = 23543808.

The previous prime is 70649833. The next prime is 70649861. The reversal of 70649856 is 65894607.

It can be written as a sum of positive squares in only one way, i.e., 66585600 + 4064256 = 8160^2 + 2016^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16516 + ... + 20348.

Almost surely, 2^70649856 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 70649856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102051495).

70649856 is an abundant number, since it is smaller than the sum of its proper divisors (133453134).

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

70649856 is a wasteful number, since it uses less digits than its factorization.

70649856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3861 (or 3838 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 70649856 is about 8405.3468697015. The cubic root of 70649856 is about 413.3999568870.

The spelling of 70649856 in words is "seventy million, six hundred forty-nine thousand, eight hundred fifty-six".