70643880 has 128 divisors (see below), whose sum is σ = 237600000. Its totient is φ = 18669312.

The previous prime is 70643849. The next prime is 70643887. The reversal of 70643880 is 8834607.

70643880 is a `hidden beast` number, since 7 + 0 + 643 + 8 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70643887) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 160701 + ... + 161139.

It is an arithmetic number, because the mean of its divisors is an integer number (1856250).

Almost surely, 2^70643880 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 70643880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118800000).

70643880 is an abundant number, since it is smaller than the sum of its proper divisors (166956120).

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

70643880 is a wasteful number, since it uses less digits than its factorization.

70643880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608 (or 598 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 70643880 is about 8404.9913741776. The cubic root of 70643880 is about 413.3883005867.

The spelling of 70643880 in words is "seventy million, six hundred forty-three thousand, eight hundred eighty".