70728840 has 384 divisors, whose sum is σ = 301916160. Its totient is φ = 13934592.

The previous prime is 70728839. The next prime is 70728859. The reversal of 70728840 is 4882707.

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 = 70728795 and 70728804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 556857 + ... + 556983.

It is an arithmetic number, because the mean of its divisors is an integer number (786240).

Almost surely, 2^70728840 is an apocalyptic number.

70728840 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 70728840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150958080).

70728840 is an abundant number, since it is smaller than the sum of its proper divisors (231187320).

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

70728840 is a wasteful number, since it uses less digits than its factorization.

70728840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 174 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 70728840 is about 8410.0439951287. The cubic root of 70728840 is about 413.5539549448.

The spelling of 70728840 in words is "seventy million, seven hundred twenty-eight thousand, eight hundred forty".