70643820 has 144 divisors (see below), whose sum is σ = 222955488. Its totient is φ = 16604160.

The previous prime is 70643809. The next prime is 70643821. The reversal of 70643820 is 2834607.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70643821) 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 47 ways as a sum of consecutive naturals, for example, 1503037 + ... + 1503083.

It is an arithmetic number, because the mean of its divisors is an integer number (1548302).

Almost surely, 2^70643820 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 70643820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111477744).

70643820 is an abundant number, since it is smaller than the sum of its proper divisors (152311668).

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

70643820 is a wasteful number, since it uses less digits than its factorization.

70643820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 70643820 is about 8404.9878048692. The cubic root of 70643820 is about 413.3881835522.

The spelling of 70643820 in words is "seventy million, six hundred forty-three thousand, eight hundred twenty".