616672081 has 8 divisors (see below), whose sum is σ = 635635880. Its totient is φ = 597829248.

The previous prime is 616672079. The next prime is 616672123. The reversal of 616672081 is 180276616.

616672081 = 17559² + 17560².

It can be written as a sum of positive squares in 4 ways, for example, as 308318481 + 308353600 = 17559^2 + 17560^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 616672081 - 2¹ = 616672079 is a prime.

It is a super-2 number, since 2×616672081² = 760568910969741122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 616672081.

It is not an unprimeable number, because it can be changed into a prime (616672031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19836 + ... + 40333.

It is an arithmetic number, because the mean of its divisors is an integer number (79454485).

Almost surely, 2^616672081 is an apocalyptic number.

616672081 is the 17560-th centered square number.

It is an amenable number.

616672081 is a deficient number, since it is larger than the sum of its proper divisors (18963799).

616672081 is a wasteful number, since it uses less digits than its factorization.

616672081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60483.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 616672081 is about 24832.8830585577. The cubic root of 616672081 is about 851.1735030013.

The spelling of 616672081 in words is "six hundred sixteen million, six hundred seventy-two thousand, eighty-one".