61978357 has 8 divisors (see below), whose sum is σ = 71004032. Its totient is φ = 52995600.

The previous prime is 61978349. The next prime is 61978363. The reversal of 61978357 is 75387916.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61978357 - 2³ = 61978349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61978157) by changing a digit.

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, 7569 + ... + 13462.

It is an arithmetic number, because the mean of its divisors is an integer number (8875504).

Almost surely, 2^61978357 is an apocalyptic number.

It is an amenable number.

61978357 is a deficient number, since it is larger than the sum of its proper divisors (9025675).

61978357 is a wasteful number, since it uses less digits than its factorization.

61978357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21459.

The product of its digits is 317520, while the sum is 46.

The square root of 61978357 is about 7872.6334221784. The cubic root of 61978357 is about 395.7431014962.

The spelling of 61978357 in words is "sixty-one million, nine hundred seventy-eight thousand, three hundred fifty-seven".