721928949 has 16 divisors (see below), whose sum is σ = 1101267072. Its totient is φ = 412086528.

The previous prime is 721928927. The next prime is 721928971. The reversal of 721928949 is 949829127.

It is an interprime number because it is at equal distance from previous prime (721928927) and next prime (721928971).

It is not a de Polignac number, because 721928949 - 2⁵ = 721928917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721928549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1977 + ... + 38049.

It is an arithmetic number, because the mean of its divisors is an integer number (68829192).

Almost surely, 2^721928949 is an apocalyptic number.

It is an amenable number.

721928949 is a deficient number, since it is larger than the sum of its proper divisors (379338123).

721928949 is a wasteful number, since it uses less digits than its factorization.

721928949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37036.

The product of its digits is 653184, while the sum is 51.

The square root of 721928949 is about 26868.7355303520. The cubic root of 721928949 is about 897.0806431029.

The spelling of 721928949 in words is "seven hundred twenty-one million, nine hundred twenty-eight thousand, nine hundred forty-nine".