61335540 has 72 divisors (see below), whose sum is σ = 212634240. Its totient is φ = 14019264.

The previous prime is 61335511. The next prime is 61335559. The reversal of 61335540 is 4553316.

61335540 is a `hidden beast` number, since 613 + 3 + 5 + 5 + 40 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23080 + ... + 25599.

Almost surely, 2^61335540 is an apocalyptic number.

61335540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61335540 is an abundant number, since it is smaller than the sum of its proper divisors (151298700).

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

61335540 is a wasteful number, since it uses less digits than its factorization.

61335540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48701 (or 48696 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 61335540 is about 7831.7009646692. The cubic root of 61335540 is about 394.3701761176.

Adding to 61335540 its reverse (4553316), we get a palindrome (65888856).

The spelling of 61335540 in words is "sixty-one million, three hundred thirty-five thousand, five hundred forty".