616778445 has 32 divisors (see below), whose sum is σ = 1052472960. Its totient is φ = 307353600.

The previous prime is 616778441. The next prime is 616778447. The reversal of 616778445 is 544877616.

It is not a de Polignac number, because 616778445 - 2² = 616778441 is a prime.

It is a super-4 number, since 4×616778445⁴ (a number of 36 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 616778394 and 616778403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616778441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26745 + ... + 44145.

It is an arithmetic number, because the mean of its divisors is an integer number (32889780).

Almost surely, 2^616778445 is an apocalyptic number.

It is an amenable number.

616778445 is a deficient number, since it is larger than the sum of its proper divisors (435694515).

616778445 is a wasteful number, since it uses less digits than its factorization.

616778445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17565.

The product of its digits is 1128960, while the sum is 48.

The square root of 616778445 is about 24835.0245620978. The cubic root of 616778445 is about 851.2224371737. Note that the first 3 decimals are identical.

The spelling of 616778445 in words is "six hundred sixteen million, seven hundred seventy-eight thousand, four hundred forty-five".