70729920 has 168 divisors, whose sum is σ = 249631200. Its totient is φ = 18370560.

The previous prime is 70729873. The next prime is 70729921. The reversal of 70729920 is 2992707.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (70729921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 117781 + ... + 118379.

It is an arithmetic number, because the mean of its divisors is an integer number (1485900).

Almost surely, 2^70729920 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 70729920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124815600).

70729920 is an abundant number, since it is smaller than the sum of its proper divisors (178901280).

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

70729920 is a wasteful number, since it uses less digits than its factorization.

70729920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663 (or 650 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 36.

The square root of 70729920 is about 8410.1082038224. The cubic root of 70729920 is about 413.5560598664.

The spelling of 70729920 in words is "seventy million, seven hundred twenty-nine thousand, nine hundred twenty".