70646640 has 80 divisors (see below), whose sum is σ = 223699968. Its totient is φ = 18435328.

The previous prime is 70646621. The next prime is 70646647. The reversal of 70646640 is 4664607.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70646647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8149 + ... + 14411.

Almost surely, 2^70646640 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 70646640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111849984).

70646640 is an abundant number, since it is smaller than the sum of its proper divisors (153053328).

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

70646640 is a wasteful number, since it uses less digits than its factorization.

70646640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6326 (or 6320 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 70646640 is about 8405.1555607258. The cubic root of 70646640 is about 413.3936841002.

The spelling of 70646640 in words is "seventy million, six hundred forty-six thousand, six hundred forty".