70821247 has 4 divisors (see below), whose sum is σ = 80938576. Its totient is φ = 60703920.

The previous prime is 70821241. The next prime is 70821251. The reversal of 70821247 is 74212807.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 70821247 - 2⁷ = 70821119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70821241) 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, 5058654 + ... + 5058667.

It is an arithmetic number, because the mean of its divisors is an integer number (20234644).

Almost surely, 2^70821247 is an apocalyptic number.

70821247 is a deficient number, since it is larger than the sum of its proper divisors (10117329).

70821247 is a wasteful number, since it uses less digits than its factorization.

70821247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10117328.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 70821247 is about 8415.5360494742. The cubic root of 70821247 is about 413.7339788675.

The spelling of 70821247 in words is "seventy million, eight hundred twenty-one thousand, two hundred forty-seven".