61616709 has 72 divisors (see below), whose sum is σ = 114528960. Its totient is φ = 31236480.

The previous prime is 61616663. The next prime is 61616749. The reversal of 61616709 is 90761616.

It is not a de Polignac number, because 61616709 - 2¹⁶ = 61551173 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61616749) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 449689 + ... + 449825.

It is an arithmetic number, because the mean of its divisors is an integer number (1590680).

Almost surely, 2^61616709 is an apocalyptic number.

It is an amenable number.

61616709 is a deficient number, since it is larger than the sum of its proper divisors (52912251).

61616709 is a wasteful number, since it uses less digits than its factorization.

61616709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 61616709 is about 7849.6311378306. The cubic root of 61616709 is about 394.9718700258.

The spelling of 61616709 in words is "sixty-one million, six hundred sixteen thousand, seven hundred nine".