61523765 has 12 divisors (see below), whose sum is σ = 78428676. Its totient is φ = 46322688.

The previous prime is 61523741. The next prime is 61523771. The reversal of 61523765 is 56732516.

It can be written as a sum of positive squares in 6 ways, for example, as 12439729 + 49084036 = 3527^2 + 7006^2 .

It is not a de Polignac number, because 61523765 - 2⁸ = 61523509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19844 + ... + 22733.

It is an arithmetic number, because the mean of its divisors is an integer number (6535723).

Almost surely, 2^61523765 is an apocalyptic number.

It is an amenable number.

61523765 is a deficient number, since it is larger than the sum of its proper divisors (16904911).

61523765 is a wasteful number, since it uses less digits than its factorization.

61523765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42616 (or 42599 counting only the distinct ones).

The product of its digits is 37800, while the sum is 35.

The square root of 61523765 is about 7843.7086253889. The cubic root of 61523765 is about 394.7731753332.

The spelling of 61523765 in words is "sixty-one million, five hundred twenty-three thousand, seven hundred sixty-five".