61278401 has 16 divisors (see below), whose sum is σ = 67287360. Its totient is φ = 55598400.

The previous prime is 61278379. The next prime is 61278407. The reversal of 61278401 is 10487216.

It is a cyclic number.

It is not a de Polignac number, because 61278401 - 2¹⁸ = 61016257 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61278407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46451 + ... + 47751.

It is an arithmetic number, because the mean of its divisors is an integer number (4205460).

Almost surely, 2^61278401 is an apocalyptic number.

It is an amenable number.

61278401 is a deficient number, since it is larger than the sum of its proper divisors (6008959).

61278401 is a wasteful number, since it uses less digits than its factorization.

61278401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1424.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 61278401 is about 7828.0521842921. The cubic root of 61278401 is about 394.2476755331.

The spelling of 61278401 in words is "sixty-one million, two hundred seventy-eight thousand, four hundred one".