70661047 has 4 divisors (see below), whose sum is σ = 71286480. Its totient is φ = 70035616.

The previous prime is 70661039. The next prime is 70661051. The reversal of 70661047 is 74016607.

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

It is a cyclic number.

It is not a de Polignac number, because 70661047 - 2³ = 70661039 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70661077) 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, 312547 + ... + 312772.

It is an arithmetic number, because the mean of its divisors is an integer number (17821620).

Almost surely, 2^70661047 is an apocalyptic number.

70661047 is a deficient number, since it is larger than the sum of its proper divisors (625433).

70661047 is a wasteful number, since it uses less digits than its factorization.

70661047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625432.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 70661047 is about 8406.0125505498. The cubic root of 70661047 is about 413.4217833748.

The spelling of 70661047 in words is "seventy million, six hundred sixty-one thousand, forty-seven".