70642745 has 4 divisors (see below), whose sum is σ = 84771300. Its totient is φ = 56514192.

The previous prime is 70642709. The next prime is 70642751. The reversal of 70642745 is 54724607.

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

It can be written as a sum of positive squares in 2 ways, for example, as 52461049 + 18181696 = 7243^2 + 4264^2 .

It is a cyclic number.

It is not a de Polignac number, because 70642745 - 2⁸ = 70642489 is a prime.

It is a super-2 number, since 2×70642745² = 9980794842270050, which contains 22 as substring.

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, 7064270 + ... + 7064279.

It is an arithmetic number, because the mean of its divisors is an integer number (21192825).

Almost surely, 2^70642745 is an apocalyptic number.

It is an amenable number.

70642745 is a deficient number, since it is larger than the sum of its proper divisors (14128555).

70642745 is a wasteful number, since it uses less digits than its factorization.

70642745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14128554.

The product of its (nonzero) digits is 47040, while the sum is 35.

The square root of 70642745 is about 8404.9238545034. The cubic root of 70642745 is about 413.3860866736.

The spelling of 70642745 in words is "seventy million, six hundred forty-two thousand, seven hundred forty-five".