70729745 has 4 divisors (see below), whose sum is σ = 84875700. Its totient is φ = 56583792.

The previous prime is 70729739. The next prime is 70729777. The reversal of 70729745 is 54792707.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54792707 = 43 ⋅1274249.

It can be written as a sum of positive squares in 2 ways, for example, as 21224449 + 49505296 = 4607^2 + 7036^2 .

It is a cyclic number.

It is not a de Polignac number, because 70729745 - 2⁸ = 70729489 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7072970 + ... + 7072979.

It is an arithmetic number, because the mean of its divisors is an integer number (21218925).

Almost surely, 2^70729745 is an apocalyptic number.

It is an amenable number.

70729745 is a deficient number, since it is larger than the sum of its proper divisors (14145955).

70729745 is a wasteful number, since it uses less digits than its factorization.

70729745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14145954.

The product of its (nonzero) digits is 123480, while the sum is 41.

The square root of 70729745 is about 8410.0977996692. The cubic root of 70729745 is about 413.5557187926. Note that the first 3 decimals are identical.

The spelling of 70729745 in words is "seventy million, seven hundred twenty-nine thousand, seven hundred forty-five".