70720553 has 4 divisors (see below), whose sum is σ = 70829508. Its totient is φ = 70611600.

The previous prime is 70720549. The next prime is 70720597. The reversal of 70720553 is 35502707.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35502707 = 107 ⋅331801.

It can be written as a sum of positive squares in 2 ways, for example, as 43388569 + 27331984 = 6587^2 + 5228^2 .

It is a cyclic number.

It is not a de Polignac number, because 70720553 - 2² = 70720549 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70720543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53498 + ... + 54803.

It is an arithmetic number, because the mean of its divisors is an integer number (17707377).

Almost surely, 2^70720553 is an apocalyptic number.

It is an amenable number.

70720553 is a deficient number, since it is larger than the sum of its proper divisors (108955).

70720553 is a wasteful number, since it uses less digits than its factorization.

70720553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108954.

The product of its (nonzero) digits is 7350, while the sum is 29.

The square root of 70720553 is about 8409.5512959967. The cubic root of 70720553 is about 413.5378028561.

The spelling of 70720553 in words is "seventy million, seven hundred twenty thousand, five hundred fifty-three".