728022949 has 4 divisors (see below), whose sum is σ = 730614060. Its totient is φ = 725431840.

The previous prime is 728022929. The next prime is 728022959. The reversal of 728022949 is 949220827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 949220827 = 311 ⋅3052157.

It can be written as a sum of positive squares in 2 ways, for example, as 190246849 + 537776100 = 13793^2 + 23190^2 .

It is a cyclic number.

It is not a de Polignac number, because 728022949 - 2⁷ = 728022821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728022929) 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, 1295134 + ... + 1295695.

It is an arithmetic number, because the mean of its divisors is an integer number (182653515).

Almost surely, 2^728022949 is an apocalyptic number.

It is an amenable number.

728022949 is a deficient number, since it is larger than the sum of its proper divisors (2591111).

728022949 is a wasteful number, since it uses less digits than its factorization.

728022949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2591110.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 728022949 is about 26981.9003963768. The cubic root of 728022949 is about 899.5977416351.

The spelling of 728022949 in words is "seven hundred twenty-eight million, twenty-two thousand, nine hundred forty-nine".