61680789 has 6 divisors (see below), whose sum is σ = 89094486. Its totient is φ = 41120520.

The previous prime is 61680781. The next prime is 61680797. The reversal of 61680789 is 98708616.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (61680781) and next prime (61680797).

It can be written as a sum of positive squares in only one way, i.e., 61355889 + 324900 = 7833^2 + 570^2 .

It is not a de Polignac number, because 61680789 - 2³ = 61680781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61680781) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3426702 + ... + 3426719.

It is an arithmetic number, because the mean of its divisors is an integer number (14849081).

Almost surely, 2^61680789 is an apocalyptic number.

It is an amenable number.

61680789 is a deficient number, since it is larger than the sum of its proper divisors (27413697).

61680789 is a wasteful number, since it uses less digits than its factorization.

61680789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6853427 (or 6853424 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 61680789 is about 7853.7117976152. The cubic root of 61680789 is about 395.1087432270.

The spelling of 61680789 in words is "sixty-one million, six hundred eighty thousand, seven hundred eighty-nine".