70921680 has 160 divisors (see below), whose sum is σ = 235223040. Its totient is φ = 17625600.

The previous prime is 70921679. The next prime is 70921691. The reversal of 70921680 is 8612907.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 469605 + ... + 469755.

It is an arithmetic number, because the mean of its divisors is an integer number (1470144).

Almost surely, 2^70921680 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70921680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117611520).

70921680 is an abundant number, since it is smaller than the sum of its proper divisors (164301360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

70921680 is a wasteful number, since it uses less digits than its factorization.

70921680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289 (or 283 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 70921680 is about 8421.5010538502. The cubic root of 70921680 is about 413.9294612486.

The spelling of 70921680 in words is "seventy million, nine hundred twenty-one thousand, six hundred eighty".