70006440 has 64 divisors (see below), whose sum is σ = 240024960. Its totient is φ = 16001280.

The previous prime is 70006429. The next prime is 70006471. The reversal of 70006440 is 4460007.

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

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 15 ways as a sum of consecutive naturals, for example, 40831 + ... + 42510.

It is an arithmetic number, because the mean of its divisors is an integer number (3750390).

Almost surely, 2^70006440 is an apocalyptic number.

70006440 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

70006440 is an abundant number, since it is smaller than the sum of its proper divisors (170018520).

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

70006440 is a wasteful number, since it uses less digits than its factorization.

70006440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83362 (or 83358 counting only the distinct ones).

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

The square root of 70006440 is about 8366.9851201015. The cubic root of 70006440 is about 412.1411682015.

Adding to 70006440 its reverse (4460007), we get a palindrome (74466447).

The spelling of 70006440 in words is "seventy million, six thousand, four hundred forty".