70642821 has 16 divisors (see below), whose sum is σ = 98803584. Its totient is φ = 44810304.

The previous prime is 70642813. The next prime is 70642853. The reversal of 70642821 is 12824607.

It is not a de Polignac number, because 70642821 - 2³ = 70642813 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70642801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10995 + ... + 16191.

It is an arithmetic number, because the mean of its divisors is an integer number (6175224).

Almost surely, 2^70642821 is an apocalyptic number.

It is an amenable number.

70642821 is a deficient number, since it is larger than the sum of its proper divisors (28160763).

70642821 is a wasteful number, since it uses less digits than its factorization.

70642821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5420.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 70642821 is about 8404.9283756615. The cubic root of 70642821 is about 413.3862349187.

The spelling of 70642821 in words is "seventy million, six hundred forty-two thousand, eight hundred twenty-one".