70728820501 has 4 divisors (see below), whose sum is σ = 74889339372. Its totient is φ = 66568301632.

The previous prime is 70728820483. The next prime is 70728820511. The reversal of 70728820501 is 10502882707.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40400598001 + 30328222500 = 200999^2 + 174150^2 .

It is a cyclic number.

It is not a de Polignac number, because 70728820501 - 2⁵ = 70728820469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70728820511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2080259410 + ... + 2080259443.

It is an arithmetic number, because the mean of its divisors is an integer number (18722334843).

Almost surely, 2^70728820501 is an apocalyptic number.

It is an amenable number.

70728820501 is a deficient number, since it is larger than the sum of its proper divisors (4160518871).

70728820501 is a wasteful number, since it uses less digits than its factorization.

70728820501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4160518870.

The product of its (nonzero) digits is 62720, while the sum is 40.

The spelling of 70728820501 in words is "seventy billion, seven hundred twenty-eight million, eight hundred twenty thousand, five hundred one".