61391340 has 36 divisors (see below), whose sum is σ = 186220944. Its totient is φ = 16370976.

The previous prime is 61391333. The next prime is 61391359. The reversal of 61391340 is 4319316.

61391340 is a `hidden beast` number, since 613 + 9 + 1 + 3 + 40 = 666.

61391340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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 11 ways as a sum of consecutive naturals, for example, 170352 + ... + 170711.

It is an arithmetic number, because the mean of its divisors is an integer number (5172804).

Almost surely, 2^61391340 is an apocalyptic number.

61391340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61391340 is an abundant number, since it is smaller than the sum of its proper divisors (124829604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61391340 is a wasteful number, since it uses less digits than its factorization.

61391340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341078 (or 341073 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 61391340 is about 7835.2625993007. The cubic root of 61391340 is about 394.4897326093.

The spelling of 61391340 in words is "sixty-one million, three hundred ninety-one thousand, three hundred forty".