61190640 has 400 divisors, whose sum is σ = 259269120. Its totient is φ = 13063680.

The previous prime is 61190627. The next prime is 61190651. The reversal of 61190640 is 4609116.

61190640 is a `hidden beast` number, since 6 + 1 + 19 + 0 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 861805 + ... + 861875.

Almost surely, 2^61190640 is an apocalyptic number.

61190640 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 61190640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129634560).

61190640 is an abundant number, since it is smaller than the sum of its proper divisors (198078480).

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

61190640 is a wasteful number, since it uses less digits than its factorization.

61190640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 61190640 is about 7822.4446306765. Note that the first 3 decimals coincide. The cubic root of 61190640 is about 394.0593759022.

Adding to 61190640 its reverse (4609116), we get a palindrome (65799756).

The spelling of 61190640 in words is "sixty-one million, one hundred ninety thousand, six hundred forty".