616740639 has 16 divisors (see below), whose sum is σ = 831087840. Its totient is φ = 406788480.

The previous prime is 616740587. The next prime is 616740661. The reversal of 616740639 is 936047616.

It is not a de Polignac number, because 616740639 - 2¹⁹ = 616216351 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 616740639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616740689) 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, 385389 + ... + 386985.

It is an arithmetic number, because the mean of its divisors is an integer number (51942990).

Almost surely, 2^616740639 is an apocalyptic number.

616740639 is a deficient number, since it is larger than the sum of its proper divisors (214347201).

616740639 is a wasteful number, since it uses less digits than its factorization.

616740639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2890.

The product of its (nonzero) digits is 163296, while the sum is 42.

The square root of 616740639 is about 24834.2634076391. The cubic root of 616740639 is about 851.2050446652.

The spelling of 616740639 in words is "six hundred sixteen million, seven hundred forty thousand, six hundred thirty-nine".