61405645 has 8 divisors (see below), whose sum is σ = 84213504. Its totient is φ = 42106704.

The previous prime is 61405627. The next prime is 61405651. The reversal of 61405645 is 54650416.

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

It is a cyclic number.

It is not a de Polignac number, because 61405645 - 2⁹ = 61405133 is a prime.

It is a super-3 number, since 3×61405645³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

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, 877189 + ... + 877258.

It is an arithmetic number, because the mean of its divisors is an integer number (10526688).

Almost surely, 2^61405645 is an apocalyptic number.

It is an amenable number.

61405645 is a deficient number, since it is larger than the sum of its proper divisors (22807859).

61405645 is a wasteful number, since it uses less digits than its factorization.

61405645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1754459.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 61405645 is about 7836.1754064084. The cubic root of 61405645 is about 394.5203706839.

The spelling of 61405645 in words is "sixty-one million, four hundred five thousand, six hundred forty-five".