70420251 has 32 divisors (see below), whose sum is σ = 111329280. Its totient is φ = 39117600.

The previous prime is 70420243. The next prime is 70420261. The reversal of 70420251 is 15202407.

It is not a de Polignac number, because 70420251 - 2³ = 70420243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (70420201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17626 + ... + 21248.

It is an arithmetic number, because the mean of its divisors is an integer number (3479040).

Almost surely, 2^70420251 is an apocalyptic number.

70420251 is a deficient number, since it is larger than the sum of its proper divisors (40909029).

70420251 is a wasteful number, since it uses less digits than its factorization.

70420251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3687.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 70420251 is about 8391.6774842698. The cubic root of 70420251 is about 412.9516346304.

Adding to 70420251 its reverse (15202407), we get a palindrome (85622658).

The spelling of 70420251 in words is "seventy million, four hundred twenty thousand, two hundred fifty-one".