61504789 has 4 divisors (see below), whose sum is σ = 61750080. Its totient is φ = 61259500.

The previous prime is 61504771. The next prime is 61504799. The reversal of 61504789 is 98740516.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61504789 - 2⁵ = 61504757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61504799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122269 + ... + 122770.

It is an arithmetic number, because the mean of its divisors is an integer number (15437520).

Almost surely, 2^61504789 is an apocalyptic number.

It is an amenable number.

61504789 is a deficient number, since it is larger than the sum of its proper divisors (245291).

61504789 is a wasteful number, since it uses less digits than its factorization.

61504789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245290.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 61504789 is about 7842.4989002231. The cubic root of 61504789 is about 394.7325840479.

The spelling of 61504789 in words is "sixty-one million, five hundred four thousand, seven hundred eighty-nine".