70155640 has 64 divisors (see below), whose sum is σ = 164656800. Its totient is φ = 26869248.

The previous prime is 70155629. The next prime is 70155641. The reversal of 70155640 is 4655107.

It is a junction number, because it is equal to n+sod(n) for n = 70155599 and 70155608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70155641) 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, 228367 + ... + 228673.

Almost surely, 2^70155640 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 70155640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82328400).

70155640 is an abundant number, since it is smaller than the sum of its proper divisors (94501160).

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

70155640 is a wasteful number, since it uses less digits than its factorization.

70155640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544 (or 540 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 70155640 is about 8375.8963699415. The cubic root of 70155640 is about 412.4337499971.

The spelling of 70155640 in words is "seventy million, one hundred fifty-five thousand, six hundred forty".