61397638 has 16 divisors (see below), whose sum is σ = 94134960. Its totient is φ = 30023136.

The previous prime is 61397617. The next prime is 61397641. The reversal of 61397638 is 83679316.

61397638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 61397594 and 61397603.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41353 + ... + 42811.

It is an arithmetic number, because the mean of its divisors is an integer number (5883435).

Almost surely, 2^61397638 is an apocalyptic number.

61397638 is a deficient number, since it is larger than the sum of its proper divisors (32737322).

61397638 is a wasteful number, since it uses less digits than its factorization.

61397638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1911.

The product of its digits is 163296, while the sum is 43.

The square root of 61397638 is about 7835.6644900098. The cubic root of 61397638 is about 394.5032220872.

The spelling of 61397638 in words is "sixty-one million, three hundred ninety-seven thousand, six hundred thirty-eight".