70157721 has 16 divisors (see below), whose sum is σ = 95385600. Its totient is φ = 45859968.

The previous prime is 70157719. The next prime is 70157723. The reversal of 70157721 is 12775107.

It is an interprime number because it is at equal distance from previous prime (70157719) and next prime (70157723).

It is not a de Polignac number, because 70157721 - 2¹ = 70157719 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (70157723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32875 + ... + 34943.

It is an arithmetic number, because the mean of its divisors is an integer number (5961600).

Almost surely, 2^70157721 is an apocalyptic number.

It is an amenable number.

70157721 is a deficient number, since it is larger than the sum of its proper divisors (25227879).

70157721 is a wasteful number, since it uses less digits than its factorization.

70157721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2288.

The product of its (nonzero) digits is 3430, while the sum is 30.

The square root of 70157721 is about 8376.0205945306. The cubic root of 70157721 is about 412.4378279118.

The spelling of 70157721 in words is "seventy million, one hundred fifty-seven thousand, seven hundred twenty-one".