70077721 has 8 divisors (see below), whose sum is σ = 80505344. Its totient is φ = 59754240.

The previous prime is 70077697. The next prime is 70077731. The reversal of 70077721 is 12777007.

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

It is not a de Polignac number, because 70077721 - 2⁹ = 70077209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70077731) 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, 24585 + ... + 27286.

It is an arithmetic number, because the mean of its divisors is an integer number (10063168).

Almost surely, 2^70077721 is an apocalyptic number.

It is an amenable number.

70077721 is a deficient number, since it is larger than the sum of its proper divisors (10427623).

70077721 is a wasteful number, since it uses less digits than its factorization.

70077721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52071.

The product of its (nonzero) digits is 4802, while the sum is 31.

The square root of 70077721 is about 8371.2436949357. The cubic root of 70077721 is about 412.2810023337.

The spelling of 70077721 in words is "seventy million, seventy-seven thousand, seven hundred twenty-one".