70381728 has 36 divisors (see below), whose sum is σ = 200148858. Its totient is φ = 23460480.

The previous prime is 70381673. The next prime is 70381741. The reversal of 70381728 is 82718307.

It can be written as a sum of positive squares in only one way, i.e., 57335184 + 13046544 = 7572^2 + 3612^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 = 70381692 and 70381701.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 121903 + ... + 122478.

Almost surely, 2^70381728 is an apocalyptic number.

It is an amenable number.

70381728 is an abundant number, since it is smaller than the sum of its proper divisors (129767130).

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

70381728 is a wasteful number, since it uses less digits than its factorization.

70381728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244397 (or 244386 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 70381728 is about 8389.3818604233. The cubic root of 70381728 is about 412.8763199433.

The spelling of 70381728 in words is "seventy million, three hundred eighty-one thousand, seven hundred twenty-eight".