70667640 has 160 divisors (see below), whose sum is σ = 251689680. Its totient is φ = 17722368.

The previous prime is 70667627. The next prime is 70667651. The reversal of 70667640 is 4676607.

70667640 is a `hidden beast` number, since 7 + 0 + 6 + 6 + 7 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 70667595 and 70667604.

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 54439 + ... + 55721.

Almost surely, 2^70667640 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 70667640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125844840).

70667640 is an abundant number, since it is smaller than the sum of its proper divisors (181022040).

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

70667640 is a wasteful number, since it uses less digits than its factorization.

70667640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1323 (or 1310 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 70667640 is about 8406.4047011787. The cubic root of 70667640 is about 413.4346410249.

It can be divided in two parts, 7066 and 7640, that added together give a triangular number (14706 = T₁₇₁).

The spelling of 70667640 in words is "seventy million, six hundred sixty-seven thousand, six hundred forty".