70321257 has 16 divisors (see below), whose sum is σ = 105737280. Its totient is φ = 46179936.

The previous prime is 70321247. The next prime is 70321267. The reversal of 70321257 is 75212307.

It is an interprime number because it is at equal distance from previous prime (70321247) and next prime (70321267).

It is not a de Polignac number, because 70321257 - 2¹⁰ = 70320233 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 70321257.

It is not an unprimeable number, because it can be changed into a prime (70321247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17628 + ... + 21245.

It is an arithmetic number, because the mean of its divisors is an integer number (6608580).

Almost surely, 2^70321257 is an apocalyptic number.

It is an amenable number.

70321257 is a deficient number, since it is larger than the sum of its proper divisors (35416023).

70321257 is a wasteful number, since it uses less digits than its factorization.

70321257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38949 (or 38943 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 70321257 is about 8385.7770659612. Note that the first 3 decimals coincide. The cubic root of 70321257 is about 412.7580402017.

The spelling of 70321257 in words is "seventy million, three hundred twenty-one thousand, two hundred fifty-seven".