70971840 has 168 divisors, whose sum is σ = 257159760. Its totient is φ = 17915904.

The previous prime is 70971799. The next prime is 70971869. The reversal of 70971840 is 4817907.

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 = 70971795 and 70971804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54072 + ... + 55368.

Almost surely, 2^70971840 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 70971840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128579880).

70971840 is an abundant number, since it is smaller than the sum of its proper divisors (186187920).

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

70971840 is a wasteful number, since it uses less digits than its factorization.

70971840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339 (or 1326 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 70971840 is about 8424.4786188820. The cubic root of 70971840 is about 414.0270233708.

The spelling of 70971840 in words is "seventy million, nine hundred seventy-one thousand, eight hundred forty".