61650405 has 24 divisors (see below), whose sum is σ = 107209440. Its totient is φ = 32772960.

The previous prime is 61650401. The next prime is 61650409. The reversal of 61650405 is 50405616.

It is a happy number.

61650405 is a `hidden beast` number, since 6 + 1 + 650 + 4 + 0 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (61650401) and next prime (61650409).

It is not a de Polignac number, because 61650405 - 2² = 61650401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61650401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12826 + ... + 16964.

It is an arithmetic number, because the mean of its divisors is an integer number (4467060).

Almost surely, 2^61650405 is an apocalyptic number.

It is an amenable number.

61650405 is a deficient number, since it is larger than the sum of its proper divisors (45559035).

61650405 is a wasteful number, since it uses less digits than its factorization.

61650405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4481 (or 4478 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 61650405 is about 7851.7771873634. Note that the first 3 decimals coincide. The cubic root of 61650405 is about 395.0438556231.

The spelling of 61650405 in words is "sixty-one million, six hundred fifty thousand, four hundred five".