61405306 has 4 divisors (see below), whose sum is σ = 92107962. Its totient is φ = 30702652.

The previous prime is 61405301. The next prime is 61405307. The reversal of 61405306 is 60350416.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 45684081 + 15721225 = 6759^2 + 3965^2 .

It is a super-2 number, since 2×61405306² = 7541223209907272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61405301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15351325 + ... + 15351328.

Almost surely, 2^61405306 is an apocalyptic number.

61405306 is a deficient number, since it is larger than the sum of its proper divisors (30702656).

61405306 is a wasteful number, since it uses less digits than its factorization.

61405306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30702655.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 61405306 is about 7836.1537759286. The cubic root of 61405306 is about 394.5196446776.

The spelling of 61405306 in words is "sixty-one million, four hundred five thousand, three hundred six".