70729856 has 64 divisors (see below), whose sum is σ = 150144000. Its totient is φ = 33094656.

The previous prime is 70729819. The next prime is 70729871. The reversal of 70729856 is 65892707.

It is a tau number, because it is divible by the number of its divisors (64).

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308750 + ... + 308978.

It is an arithmetic number, because the mean of its divisors is an integer number (2346000).

Almost surely, 2^70729856 is an apocalyptic number.

70729856 is a gapful number since it is divisible by the number (76) 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 70729856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75072000).

70729856 is an abundant number, since it is smaller than the sum of its proper divisors (79414144).

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

70729856 is a wasteful number, since it uses less digits than its factorization.

70729856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389 (or 377 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 70729856 is about 8410.1043988764. The cubic root of 70729856 is about 413.5559351309. Note that the first 3 decimals are identical.

The spelling of 70729856 in words is "seventy million, seven hundred twenty-nine thousand, eight hundred fifty-six".