70879561 has 3 divisors (see below), whose sum is σ = 70887981. Its totient is φ = 70871142.

The previous prime is 70879493. The next prime is 70879573. The reversal of 70879561 is 16597807.

The square root of 70879561 is 8419.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16597807 = 193 ⋅85999.

It is not a de Polignac number, because 70879561 - 2⁷ = 70879433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70879661) 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 2 ways as a sum of consecutive naturals, for example, 4210 + ... + 12628.

It is an arithmetic number, because the mean of its divisors is an integer number (23629327).

Almost surely, 2^70879561 is an apocalyptic number.

70879561 is the 8419-th square number.

70879561 is the 4210-th centered octagonal number.

It is an amenable number.

70879561 is a deficient number, since it is larger than the sum of its proper divisors (8420).

70879561 is an frugal number, since it uses more digits than its factorization.

70879561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16838 (or 8419 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 43.

The cubic root of 70879561 is about 413.8475034824.

The spelling of 70879561 in words is "seventy million, eight hundred seventy-nine thousand, five hundred sixty-one".