61577789 has 8 divisors (see below), whose sum is σ = 75788160. Its totient is φ = 48720816.

The previous prime is 61577779. The next prime is 61577797. The reversal of 61577789 is 98777516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61577789 - 2⁴ = 61577773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61577779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 338249 + ... + 338430.

It is an arithmetic number, because the mean of its divisors is an integer number (9473520).

Almost surely, 2^61577789 is an apocalyptic number.

It is an amenable number.

61577789 is a deficient number, since it is larger than the sum of its proper divisors (14210371).

61577789 is a wasteful number, since it uses less digits than its factorization.

61577789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676699.

The product of its digits is 740880, while the sum is 50.

The square root of 61577789 is about 7847.1516488469. The cubic root of 61577789 is about 394.8886915980. Note that the first 3 decimals are identical.

The spelling of 61577789 in words is "sixty-one million, five hundred seventy-seven thousand, seven hundred eighty-nine".