61489765 has 8 divisors (see below), whose sum is σ = 78128280. Its totient is φ = 46298112.

The previous prime is 61489759. The next prime is 61489777. The reversal of 61489765 is 56798416.

It can be written as a sum of positive squares in 4 ways, for example, as 6640929 + 54848836 = 2577^2 + 7406^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61489765 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 361620 + ... + 361789.

It is an arithmetic number, because the mean of its divisors is an integer number (9766035).

Almost surely, 2^61489765 is an apocalyptic number.

It is an amenable number.

61489765 is a deficient number, since it is larger than the sum of its proper divisors (16638515).

61489765 is a wasteful number, since it uses less digits than its factorization.

61489765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723431.

The product of its digits is 362880, while the sum is 46.

The square root of 61489765 is about 7841.5409837608. The cubic root of 61489765 is about 394.7004405060.

The spelling of 61489765 in words is "sixty-one million, four hundred eighty-nine thousand, seven hundred sixty-five".