70747720 has 32 divisors (see below), whose sum is σ = 159491520. Its totient is φ = 28244160.

The previous prime is 70747711. The next prime is 70747723. The reversal of 70747720 is 2774707.

70747720 = 419² + 420² + ... + 658².

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (70747723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23839 + ... + 26641.

It is an arithmetic number, because the mean of its divisors is an integer number (4984110).

Almost surely, 2^70747720 is an apocalyptic number.

It is an amenable number.

70747720 is an abundant number, since it is smaller than the sum of its proper divisors (88743800).

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

70747720 is a wasteful number, since it uses less digits than its factorization.

70747720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3445 (or 3441 counting only the distinct ones).

The product of its (nonzero) digits is 19208, while the sum is 34.

The square root of 70747720 is about 8411.1663876064. The cubic root of 70747720 is about 413.5907490071.

The spelling of 70747720 in words is "seventy million, seven hundred forty-seven thousand, seven hundred twenty".