61678149 has 16 divisors (see below), whose sum is σ = 90959232. Its totient is φ = 36929088.

The previous prime is 61678109. The next prime is 61678163. The reversal of 61678149 is 94187616.

It is not a de Polignac number, because 61678149 - 2¹³ = 61669957 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 61678149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61678109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19929 + ... + 22814.

It is an arithmetic number, because the mean of its divisors is an integer number (5684952).

Almost surely, 2^61678149 is an apocalyptic number.

It is an amenable number.

61678149 is a deficient number, since it is larger than the sum of its proper divisors (29281083).

61678149 is a wasteful number, since it uses less digits than its factorization.

61678149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42796.

The product of its digits is 72576, while the sum is 42.

The square root of 61678149 is about 7853.5437224224. The cubic root of 61678149 is about 395.1031061290.

The spelling of 61678149 in words is "sixty-one million, six hundred seventy-eight thousand, one hundred forty-nine".