70561440 has 144 divisors (see below), whose sum is σ = 253562400. Its totient is φ = 17819136.

The previous prime is 70561427. The next prime is 70561453. The reversal of 70561440 is 4416507.

70561440 is a `hidden beast` number, since 7 + 0 + 5 + 614 + 40 = 666.

It is an interprime number because it is at equal distance from previous prime (70561427) and next prime (70561453).

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26071 + ... + 28649.

It is an arithmetic number, because the mean of its divisors is an integer number (1760850).

Almost surely, 2^70561440 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 70561440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126781200).

70561440 is an abundant number, since it is smaller than the sum of its proper divisors (183000960).

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

70561440 is a wasteful number, since it uses less digits than its factorization.

70561440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2619 (or 2608 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 70561440 is about 8400.0857138484. The cubic root of 70561440 is about 413.2274326913.

Adding to 70561440 its reverse (4416507), we get a palindrome (74977947).

The spelling of 70561440 in words is "seventy million, five hundred sixty-one thousand, four hundred forty".