70688561 has 4 divisors (see below), whose sum is σ = 70766400. Its totient is φ = 70610724.

The previous prime is 70688543. The next prime is 70688593. The reversal of 70688561 is 16588607.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70688561 is a prime.

It is a super-3 number, since 3×70688561³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70688521) 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, 37541 + ... + 39378.

It is an arithmetic number, because the mean of its divisors is an integer number (17691600).

Almost surely, 2^70688561 is an apocalyptic number.

It is an amenable number.

70688561 is a deficient number, since it is larger than the sum of its proper divisors (77839).

70688561 is an equidigital number, since it uses as much as digits as its factorization.

70688561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77838.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 70688561 is about 8407.6489579430. The cubic root of 70688561 is about 413.4754358060.

The spelling of 70688561 in words is "seventy million, six hundred eighty-eight thousand, five hundred sixty-one".