70420257 has 12 divisors (see below), whose sum is σ = 101979540. Its totient is φ = 46826208.

The previous prime is 70420243. The next prime is 70420261. The reversal of 70420257 is 75202407.

It can be written as a sum of positive squares in 2 ways, for example, as 41679936 + 28740321 = 6456^2 + 5361^2 .

It is not a de Polignac number, because 70420257 - 2⁶ = 70420193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 70420257.

It is not an unprimeable number, because it can be changed into a prime (70420267) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6282 + ... + 13427.

It is an arithmetic number, because the mean of its divisors is an integer number (8498295).

Almost surely, 2^70420257 is an apocalyptic number.

It is an amenable number.

70420257 is a deficient number, since it is larger than the sum of its proper divisors (31559283).

70420257 is a wasteful number, since it uses less digits than its factorization.

70420257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20112 (or 20109 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 27.

The square root of 70420257 is about 8391.6778417668. The cubic root of 70420257 is about 412.9516463586.

The spelling of 70420257 in words is "seventy million, four hundred twenty thousand, two hundred fifty-seven".