70632821 has 4 divisors (see below), whose sum is σ = 80723232. Its totient is φ = 60542412.

The previous prime is 70632767. The next prime is 70632833. The reversal of 70632821 is 12823607.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 70632821 - 2¹⁴ = 70616437 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 (70632871) 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, 5045195 + ... + 5045208.

It is an arithmetic number, because the mean of its divisors is an integer number (20180808).

Almost surely, 2^70632821 is an apocalyptic number.

It is an amenable number.

70632821 is a deficient number, since it is larger than the sum of its proper divisors (10090411).

70632821 is a wasteful number, since it uses less digits than its factorization.

70632821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10090410.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 70632821 is about 8404.3334655403. Note that the first 3 decimals coincide. The cubic root of 70632821 is about 413.3667280655.

The spelling of 70632821 in words is "seventy million, six hundred thirty-two thousand, eight hundred twenty-one".