70021328 has 40 divisors (see below), whose sum is σ = 146844768. Its totient is φ = 32153472.

The previous prime is 70021313. The next prime is 70021333. The reversal of 70021328 is 82312007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46475 + ... + 47957.

Almost surely, 2^70021328 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 70021328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73422384).

70021328 is an abundant number, since it is smaller than the sum of its proper divisors (76823440).

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

70021328 is a wasteful number, since it uses less digits than its factorization.

70021328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1731 (or 1725 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 70021328 is about 8367.8747600571. The cubic root of 70021328 is about 412.1703822891.

The spelling of 70021328 in words is "seventy million, twenty-one thousand, three hundred twenty-eight".