70644 has 36 divisors (see below), whose sum is σ = 195104. Its totient is φ = 19488.

The previous prime is 70639. The next prime is 70657. The reversal of 70644 is 44607.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 70644.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 70644.

It is an unprimeable number.

It is a nontrivial repunit in base 41.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2422 + ... + 2450.

2⁷⁰⁶⁴⁴ 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 70644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97552).

70644 is an abundant number, since it is smaller than the sum of its proper divisors (124460).

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

70644 is a wasteful number, since it uses less digits than its factorization.

70644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72 (or 41 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 70644 is about 265.7893903074. The cubic root of 70644 is about 41.3388534655.

Multiplying 70644 by its sum of digits (21), we get a square (1483524 = 1218²).

70644 divided by its sum of digits (21) gives a square (3364 = 58²).

The spelling of 70644 in words is "seventy thousand, six hundred forty-four".