61604289 has 36 divisors (see below), whose sum is σ = 95652336. Its totient is φ = 38191824.

The previous prime is 61604273. The next prime is 61604299. The reversal of 61604289 is 98240616.

It is not a de Polignac number, because 61604289 - 2⁴ = 61604273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61604219) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 217542 + ... + 217824.

Almost surely, 2^61604289 is an apocalyptic number.

It is an amenable number.

61604289 is a deficient number, since it is larger than the sum of its proper divisors (34048047).

61604289 is a wasteful number, since it uses less digits than its factorization.

61604289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394 (or 372 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 61604289 is about 7848.8399779840. The cubic root of 61604289 is about 394.9453302536.

The spelling of 61604289 in words is "sixty-one million, six hundred four thousand, two hundred eighty-nine".