70721020 has 24 divisors (see below), whose sum is σ = 157251024. Its totient is φ = 26624256.

The previous prime is 70721017. The next prime is 70721039. The reversal of 70721020 is 2012707.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103662 + ... + 104341.

It is an arithmetic number, because the mean of its divisors is an integer number (6552126).

Almost surely, 2^70721020 is an apocalyptic number.

It is an amenable number.

70721020 is an abundant number, since it is smaller than the sum of its proper divisors (86530004).

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

70721020 is a wasteful number, since it uses less digits than its factorization.

70721020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208029 (or 208027 counting only the distinct ones).

The product of its (nonzero) digits is 196, while the sum is 19.

The square root of 70721020 is about 8409.5790619983. The cubic root of 70721020 is about 413.5387131136.

Adding to 70721020 its reverse (2012707), we get a palindrome (72733727).

The spelling of 70721020 in words is "seventy million, seven hundred twenty-one thousand, twenty".