61758945 has 12 divisors (see below), whose sum is σ = 107048916. Its totient is φ = 32938080.

The previous prime is 61758929. The next prime is 61758953. The reversal of 61758945 is 54985716.

61758945 is a `hidden beast` number, since 61 + 7 + 589 + 4 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 14107536 + 47651409 = 3756^2 + 6903^2 .

It is not a de Polignac number, because 61758945 - 2⁴ = 61758929 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1372421 = 61758945 / (6 + 1 + 7 + 5 + 8 + 9 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 61758945.

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, 686166 + ... + 686255.

It is an arithmetic number, because the mean of its divisors is an integer number (8920743).

Almost surely, 2^61758945 is an apocalyptic number.

It is an amenable number.

61758945 is a deficient number, since it is larger than the sum of its proper divisors (45289971).

61758945 is a wasteful number, since it uses less digits than its factorization.

61758945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1372432 (or 1372429 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The square root of 61758945 is about 7858.6859588611. The cubic root of 61758945 is about 395.2755541354.

The spelling of 61758945 in words is "sixty-one million, seven hundred fifty-eight thousand, nine hundred forty-five".