616747021 has 16 divisors (see below), whose sum is σ = 682859520. Its totient is φ = 552348720.

The previous prime is 616747013. The next prime is 616747057. The reversal of 616747021 is 120747616.

It is a happy number.

It is not a de Polignac number, because 616747021 - 2³ = 616747013 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 (616747121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 421990 + ... + 423448.

It is an arithmetic number, because the mean of its divisors is an integer number (42678720).

Almost surely, 2^616747021 is an apocalyptic number.

It is an amenable number.

616747021 is a deficient number, since it is larger than the sum of its proper divisors (66112499).

616747021 is a wasteful number, since it uses less digits than its factorization.

616747021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2016.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 616747021 is about 24834.3918991386. The cubic root of 616747021 is about 851.2079807302.

The spelling of 616747021 in words is "six hundred sixteen million, seven hundred forty-seven thousand, twenty-one".