61778445 has 16 divisors (see below), whose sum is σ = 100949760. Its totient is φ = 32247104.

The previous prime is 61778417. The next prime is 61778471. The reversal of 61778445 is 54487716.

It is a cyclic number.

It is not a de Polignac number, because 61778445 - 2⁷ = 61778317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61778397 and 61778406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43110 + ... + 44519.

It is an arithmetic number, because the mean of its divisors is an integer number (6309360).

Almost surely, 2^61778445 is an apocalyptic number.

It is an amenable number.

61778445 is a deficient number, since it is larger than the sum of its proper divisors (39171315).

61778445 is a wasteful number, since it uses less digits than its factorization.

61778445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87684.

The product of its digits is 188160, while the sum is 42.

The square root of 61778445 is about 7859.9265263741. The cubic root of 61778445 is about 395.3171516843.

The spelling of 61778445 in words is "sixty-one million, seven hundred seventy-eight thousand, four hundred forty-five".