70243645 has 4 divisors (see below), whose sum is σ = 84292380. Its totient is φ = 56194912.

The previous prime is 70243601. The next prime is 70243651. The reversal of 70243645 is 54634207.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54634207 = 197 ⋅277331.

It can be written as a sum of positive squares in 2 ways, for example, as 55666521 + 14577124 = 7461^2 + 3818^2 .

It is a cyclic number.

It is not a de Polignac number, because 70243645 - 2¹³ = 70235453 is a prime.

It is a congruent number.

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, 7024360 + ... + 7024369.

It is an arithmetic number, because the mean of its divisors is an integer number (21073095).

Almost surely, 2^70243645 is an apocalyptic number.

It is an amenable number.

70243645 is a deficient number, since it is larger than the sum of its proper divisors (14048735).

70243645 is a wasteful number, since it uses less digits than its factorization.

70243645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14048734.

The product of its (nonzero) digits is 20160, while the sum is 31.

The square root of 70243645 is about 8381.1481910297. The cubic root of 70243645 is about 412.6061336941.

The spelling of 70243645 in words is "seventy million, two hundred forty-three thousand, six hundred forty-five".