35072721 has 6 divisors (see below), whose sum is σ = 50660610. Its totient is φ = 23381808.

The previous prime is 35072711. The next prime is 35072731. The reversal of 35072721 is 12727053.

It is an interprime number because it is at equal distance from previous prime (35072711) and next prime (35072731).

It can be written as a sum of positive squares in only one way, i.e., 19580625 + 15492096 = 4425^2 + 3936^2 .

It is not a de Polignac number, because 35072721 - 2⁶ = 35072657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (35072711) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1948476 + ... + 1948493.

It is an arithmetic number, because the mean of its divisors is an integer number (8443435).

Almost surely, 2^35072721 is an apocalyptic number.

It is an amenable number.

35072721 is a deficient number, since it is larger than the sum of its proper divisors (15587889).

35072721 is a wasteful number, since it uses less digits than its factorization.

35072721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3896975 (or 3896972 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 35072721 is about 5922.2226401918. Note that the first 3 decimals coincide. The cubic root of 35072721 is about 327.3330221191. Note that the first 3 decimals are identical.

Adding to 35072721 its reverse (12727053), we get a palindrome (47799774).

The spelling of 35072721 in words is "thirty-five million, seventy-two thousand, seven hundred twenty-one".