70731306 has 40 divisors (see below), whose sum is σ = 160688484. Its totient is φ = 23250240.

The previous prime is 70731301. The next prime is 70731329. The reversal of 70731306 is 60313707.

It can be written as a sum of positive squares in 2 ways, for example, as 65464281 + 5267025 = 8091^2 + 2295^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 70731306.

It is not an unprimeable number, because it can be changed into a prime (70731301) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8836 + ... + 14816.

Almost surely, 2^70731306 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70731306, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80344242).

70731306 is an abundant number, since it is smaller than the sum of its proper divisors (89957178).

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

70731306 is a wasteful number, since it uses less digits than its factorization.

70731306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6068 (or 6059 counting only the distinct ones).

The product of its (nonzero) digits is 2646, while the sum is 27.

The square root of 70731306 is about 8410.1906042610. The cubic root of 70731306 is about 413.5587611511.

The spelling of 70731306 in words is "seventy million, seven hundred thirty-one thousand, three hundred six".