61978355 has 8 divisors (see below), whose sum is σ = 74457792. Its totient is φ = 49526848.

The previous prime is 61978349. The next prime is 61978363. The reversal of 61978355 is 55387916.

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 61978355 - 2⁸ = 61978099 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1739 + ... + 11268.

It is an arithmetic number, because the mean of its divisors is an integer number (9307224).

Almost surely, 2^61978355 is an apocalyptic number.

61978355 is a deficient number, since it is larger than the sum of its proper divisors (12479437).

61978355 is a wasteful number, since it uses less digits than its factorization.

61978355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13965.

The product of its digits is 226800, while the sum is 44.

The square root of 61978355 is about 7872.6332951561. The cubic root of 61978355 is about 395.7430972395.

The spelling of 61978355 in words is "sixty-one million, nine hundred seventy-eight thousand, three hundred fifty-five".