61931340 has 144 divisors (see below), whose sum is σ = 204658272. Its totient is φ = 15095808.

The previous prime is 61931329. The next prime is 61931369. The reversal of 61931340 is 4313916.

61931340 is a `hidden beast` number, since 619 + 3 + 1 + 3 + 40 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 112947 + ... + 113493.

It is an arithmetic number, because the mean of its divisors is an integer number (1421238).

Almost surely, 2^61931340 is an apocalyptic number.

61931340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61931340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102329136).

61931340 is an abundant number, since it is smaller than the sum of its proper divisors (142726932).

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

61931340 is a wasteful number, since it uses less digits than its factorization.

61931340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616 (or 611 counting only the distinct ones).

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

The square root of 61931340 is about 7869.6467519197. The cubic root of 61931340 is about 395.6430054772.

The spelling of 61931340 in words is "sixty-one million, nine hundred thirty-one thousand, three hundred forty".