35728921 has 4 divisors (see below), whose sum is σ = 35822592. Its totient is φ = 35635252.

The previous prime is 35728909. The next prime is 35728933. The reversal of 35728921 is 12982753.

35728921 = T₄₈₇₉ + T₄₈₈₀ + T₄₈₈₁.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12982753 = 7 ⋅1854679.

It is an interprime number because it is at equal distance from previous prime (35728909) and next prime (35728933).

It is a cyclic number.

It is not a de Polignac number, because 35728921 - 2⁹ = 35728409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (35728991) 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, 46261 + ... + 47026.

It is an arithmetic number, because the mean of its divisors is an integer number (8955648).

Almost surely, 2^35728921 is an apocalyptic number.

35728921 is the 4881-st centered triangular number.

It is an amenable number.

35728921 is a deficient number, since it is larger than the sum of its proper divisors (93671).

35728921 is an equidigital number, since it uses as much as digits as its factorization.

35728921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93670.

The product of its digits is 30240, while the sum is 37.

The square root of 35728921 is about 5977.3673971072. The cubic root of 35728921 is about 329.3618552293.

The spelling of 35728921 in words is "thirty-five million, seven hundred twenty-eight thousand, nine hundred twenty-one".