616672891 has 4 divisors (see below), whose sum is σ = 625877032. Its totient is φ = 607468752.

The previous prime is 616672883. The next prime is 616672939. The reversal of 616672891 is 198276616.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 616672891 - 2³ = 616672883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (616672811) 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, 4601970 + ... + 4602103.

It is an arithmetic number, because the mean of its divisors is an integer number (156469258).

Almost surely, 2^616672891 is an apocalyptic number.

616672891 is a deficient number, since it is larger than the sum of its proper divisors (9204141).

616672891 is an equidigital number, since it uses as much as digits as its factorization.

616672891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9204140.

The product of its digits is 217728, while the sum is 46.

The square root of 616672891 is about 24832.8993675728. The cubic root of 616672891 is about 851.1738756738.

The spelling of 616672891 in words is "six hundred sixteen million, six hundred seventy-two thousand, eight hundred ninety-one".