34720157 has 4 divisors (see below), whose sum is σ = 34745820. Its totient is φ = 34694496.

The previous prime is 34720139. The next prime is 34720159. The reversal of 34720157 is 75102743.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75102743 = 1663 ⋅45161.

It can be written as a sum of positive squares in 2 ways, for example, as 15832441 + 18887716 = 3979^2 + 4346^2 .

It is a cyclic number.

It is not a de Polignac number, because 34720157 - 2¹⁸ = 34458013 is a prime.

It is a super-3 number, since 3×34720157³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (34720159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10682 + ... + 13547.

It is an arithmetic number, because the mean of its divisors is an integer number (8686455).

Almost surely, 2^34720157 is an apocalyptic number.

It is an amenable number.

34720157 is a deficient number, since it is larger than the sum of its proper divisors (25663).

34720157 is a wasteful number, since it uses less digits than its factorization.

34720157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25662.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 34720157 is about 5892.3812673655. The cubic root of 34720157 is about 326.2325019118.

The spelling of 34720157 in words is "thirty-four million, seven hundred twenty thousand, one hundred fifty-seven".