70721105 has 64 divisors (see below), whose sum is σ = 113799168. Its totient is φ = 40919040.

The previous prime is 70721069. The next prime is 70721107. The reversal of 70721105 is 50112707.

It is a happy number.

It is not a de Polignac number, because 70721105 - 2¹⁶ = 70655569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (70721107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 317024 + ... + 317246.

It is an arithmetic number, because the mean of its divisors is an integer number (1778112).

Almost surely, 2^70721105 is an apocalyptic number.

It is an amenable number.

70721105 is a deficient number, since it is larger than the sum of its proper divisors (43078063).

70721105 is a wasteful number, since it uses less digits than its factorization.

70721105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306.

The product of its (nonzero) digits is 490, while the sum is 23.

The square root of 70721105 is about 8409.5841157574. The cubic root of 70721105 is about 413.5388787917.

It can be divided in two parts, 707 and 21105, that added together give a palindrome (21812).

The spelling of 70721105 in words is "seventy million, seven hundred twenty-one thousand, one hundred five".