70517721 has 16 divisors (see below), whose sum is σ = 101277440. Its totient is φ = 43500240.

The previous prime is 70517669. The next prime is 70517731. The reversal of 70517721 is 12771507.

It is not a de Polignac number, because 70517721 - 2¹³ = 70509529 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (70517731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11935 + ... + 16836.

It is an arithmetic number, because the mean of its divisors is an integer number (6329840).

Almost surely, 2^70517721 is an apocalyptic number.

It is an amenable number.

70517721 is a deficient number, since it is larger than the sum of its proper divisors (30759719).

70517721 is a wasteful number, since it uses less digits than its factorization.

70517721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28836.

The product of its (nonzero) digits is 3430, while the sum is 30.

The square root of 70517721 is about 8397.4830157613. The cubic root of 70517721 is about 413.1420715151.

The spelling of 70517721 in words is "seventy million, five hundred seventeen thousand, seven hundred twenty-one".