61445405 has 8 divisors (see below), whose sum is σ = 84268032. Its totient is φ = 42133968.

The previous prime is 61445401. The next prime is 61445413. The reversal of 61445405 is 50454416.

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 61445405 - 2² = 61445401 is a prime.

It is a super-2 number, since 2×61445405² = 7551075591228050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61445401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 877757 + ... + 877826.

It is an arithmetic number, because the mean of its divisors is an integer number (10533504).

Almost surely, 2^61445405 is an apocalyptic number.

It is an amenable number.

61445405 is a deficient number, since it is larger than the sum of its proper divisors (22822627).

61445405 is a wasteful number, since it uses less digits than its factorization.

61445405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1755595.

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 61445405 is about 7838.7119477628. The cubic root of 61445405 is about 394.6055026267.

The spelling of 61445405 in words is "sixty-one million, four hundred forty-five thousand, four hundred five".