70721147 has 8 divisors (see below), whose sum is σ = 81118176. Its totient is φ = 60397632.

The previous prime is 70721141. The next prime is 70721153. The reversal of 70721147 is 74112707.

It is an interprime number because it is at equal distance from previous prime (70721141) and next prime (70721153).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 70721147 - 2⁸ = 70720891 is a prime.

It is a super-3 number, since 3×70721147³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70721141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16298 + ... + 20175.

It is an arithmetic number, because the mean of its divisors is an integer number (10139772).

Almost surely, 2^70721147 is an apocalyptic number.

70721147 is a deficient number, since it is larger than the sum of its proper divisors (10397029).

70721147 is a wasteful number, since it uses less digits than its factorization.

70721147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36757.

The product of its (nonzero) digits is 2744, while the sum is 29.

The square root of 70721147 is about 8409.5866129079. The cubic root of 70721147 is about 413.5389606561.

The spelling of 70721147 in words is "seventy million, seven hundred twenty-one thousand, one hundred forty-seven".