70721357 has 6 divisors (see below), whose sum is σ = 82267758. Its totient is φ = 60618264.

The previous prime is 70721341. The next prime is 70721359. The reversal of 70721357 is 75312707.

It can be written as a sum of positive squares in only one way, i.e., 63904036 + 6817321 = 7994^2 + 2611^2 .

It is not a de Polignac number, because 70721357 - 2⁴ = 70721341 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 (70721359) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 721598 + ... + 721695.

It is an arithmetic number, because the mean of its divisors is an integer number (13711293).

Almost surely, 2^70721357 is an apocalyptic number.

It is an amenable number.

70721357 is a deficient number, since it is larger than the sum of its proper divisors (11546401).

70721357 is a wasteful number, since it uses less digits than its factorization.

70721357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1443307 (or 1443300 counting only the distinct ones).

The product of its (nonzero) digits is 10290, while the sum is 32.

The square root of 70721357 is about 8409.5990986491. The cubic root of 70721357 is about 413.5393699778.

The spelling of 70721357 in words is "seventy million, seven hundred twenty-one thousand, three hundred fifty-seven".