70161780 has 96 divisors (see below), whose sum is σ = 212978304. Its totient is φ = 17155584.

The previous prime is 70161769. The next prime is 70161781. The reversal of 70161780 is 8716107.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70161781) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 228387 + ... + 228693.

It is an arithmetic number, because the mean of its divisors is an integer number (2218524).

Almost surely, 2^70161780 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 70161780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106489152).

70161780 is an abundant number, since it is smaller than the sum of its proper divisors (142816524).

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

70161780 is a wasteful number, since it uses less digits than its factorization.

70161780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625 (or 623 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 30.

The square root of 70161780 is about 8376.2628898573. The cubic root of 70161780 is about 412.4457816710.

Adding to 70161780 its reverse (8716107), we get a palindrome (78877887).

It can be divided in two parts, 701 and 61780, that added together give a triangular number (62481 = T₃₅₃).

The spelling of 70161780 in words is "seventy million, one hundred sixty-one thousand, seven hundred eighty".