70516821 has 8 divisors (see below), whose sum is σ = 94149664. Its totient is φ = 46947600.

The previous prime is 70516801. The next prime is 70516879. The reversal of 70516821 is 12861507.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 70516821 - 2¹³ = 70508629 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 (70516801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13255 + ... + 17796.

It is an arithmetic number, because the mean of its divisors is an integer number (11768708).

Almost surely, 2^70516821 is an apocalyptic number.

It is an amenable number.

70516821 is a deficient number, since it is larger than the sum of its proper divisors (23632843).

70516821 is a wasteful number, since it uses less digits than its factorization.

70516821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31811.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 70516821 is about 8397.4294281048. The cubic root of 70516821 is about 413.1403138980.

The spelling of 70516821 in words is "seventy million, five hundred sixteen thousand, eight hundred twenty-one".