70721344 has 42 divisors (see below), whose sum is σ = 148160994. Its totient is φ = 33488640.

The previous prime is 70721341. The next prime is 70721359. The reversal of 70721344 is 44312707.

It can be written as a sum of positive squares in only one way, i.e., 69889600 + 831744 = 8360^2 + 912^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70721341) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21574 + ... + 24634.

Almost surely, 2^70721344 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 70721344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74080497).

70721344 is an abundant number, since it is smaller than the sum of its proper divisors (77439650).

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

70721344 is a wasteful number, since it uses less digits than its factorization.

70721344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3111 (or 3082 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 70721344 is about 8409.5983257228. The cubic root of 70721344 is about 413.5393446389.

The spelling of 70721344 in words is "seventy million, seven hundred twenty-one thousand, three hundred forty-four".