83746721 has 4 divisors (see below), whose sum is σ = 84406272. Its totient is φ = 83087172.

The previous prime is 83746697. The next prime is 83746739. The reversal of 83746721 is 12764738.

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.

It is a cyclic number.

It is not a de Polignac number, because 83746721 - 2²⁶ = 16637857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83746921) 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, 329585 + ... + 329838.

It is an arithmetic number, because the mean of its divisors is an integer number (21101568).

Almost surely, 2^83746721 is an apocalyptic number.

It is an amenable number.

83746721 is a deficient number, since it is larger than the sum of its proper divisors (659551).

83746721 is a wasteful number, since it uses less digits than its factorization.

83746721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659550.

The product of its digits is 56448, while the sum is 38.

The square root of 83746721 is about 9151.3234562002. The cubic root of 83746721 is about 437.5112961437.

The spelling of 83746721 in words is "eighty-three million, seven hundred forty-six thousand, seven hundred twenty-one".