61978133 has 16 divisors (see below), whose sum is σ = 77136000. Its totient is φ = 48589632.

The previous prime is 61978129. The next prime is 61978139. The reversal of 61978133 is 33187916.

It is not a de Polignac number, because 61978133 - 2² = 61978129 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 (61978139) 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, 4178 + ... + 11891.

It is an arithmetic number, because the mean of its divisors is an integer number (4821000).

Almost surely, 2^61978133 is an apocalyptic number.

It is an amenable number.

61978133 is a deficient number, since it is larger than the sum of its proper divisors (15157867).

61978133 is a wasteful number, since it uses less digits than its factorization.

61978133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16124.

The product of its digits is 27216, while the sum is 38.

The square root of 61978133 is about 7872.6191956680. The cubic root of 61978133 is about 395.7426247354.

The spelling of 61978133 in words is "sixty-one million, nine hundred seventy-eight thousand, one hundred thirty-three".