61330440 has 32 divisors (see below), whose sum is σ = 183991680. Its totient is φ = 16354752.

The previous prime is 61330391. The next prime is 61330453. The reversal of 61330440 is 4403316.

It is a super-2 number, since 2×61330440² = 7522845741187200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255424 + ... + 255663.

It is an arithmetic number, because the mean of its divisors is an integer number (5749740).

Almost surely, 2^61330440 is an apocalyptic number.

61330440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61330440 is an abundant number, since it is smaller than the sum of its proper divisors (122661240).

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

61330440 is a wasteful number, since it uses less digits than its factorization.

61330440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511101 (or 511097 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 61330440 is about 7831.3753581347. The cubic root of 61330440 is about 394.3592452954.

Adding to 61330440 its reverse (4403316), we get a palindrome (65733756).

The spelling of 61330440 in words is "sixty-one million, three hundred thirty thousand, four hundred forty".