70138897920 has 1680 divisors, whose sum is σ = 321218971920. Its totient is φ = 14547714048.

The previous prime is 70138897909. The next prime is 70138897921. The reversal of 70138897920 is 2979883107.

It is a tau number, because it is divible by the number of its divisors (1680).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70138897921) by changing a digit.

It is a polite number, since it can be written in 167 ways as a sum of consecutive naturals, for example, 1188794851 + ... + 1188794909.

It is an arithmetic number, because the mean of its divisors is an integer number (191201769).

Almost surely, 2^70138897920 is an apocalyptic number.

70138897920 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70138897920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160609485960).

70138897920 is an abundant number, since it is smaller than the sum of its proper divisors (251080074000).

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

70138897920 is an equidigital number, since it uses as much as digits as its factorization.

70138897920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 54.

The spelling of 70138897920 in words is "seventy billion, one hundred thirty-eight million, eight hundred ninety-seven thousand, nine hundred twenty".