70545257 has 4 divisors (see below), whose sum is σ = 74694996. Its totient is φ = 66395520.

The previous prime is 70545253. The next prime is 70545263. The reversal of 70545257 is 75254507.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75254507 = 29 ⋅2594983.

It can be written as a sum of positive squares in 2 ways, for example, as 56490256 + 14055001 = 7516^2 + 3749^2 .

It is a cyclic number.

It is not a de Polignac number, because 70545257 - 2² = 70545253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70545253) 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, 2074844 + ... + 2074877.

It is an arithmetic number, because the mean of its divisors is an integer number (18673749).

Almost surely, 2^70545257 is an apocalyptic number.

It is an amenable number.

70545257 is a deficient number, since it is larger than the sum of its proper divisors (4149739).

70545257 is a wasteful number, since it uses less digits than its factorization.

70545257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4149738.

The product of its (nonzero) digits is 49000, while the sum is 35.

The square root of 70545257 is about 8399.1223946315. The cubic root of 70545257 is about 413.1958395585.

The spelling of 70545257 in words is "seventy million, five hundred forty-five thousand, two hundred fifty-seven".