61323540 has 24 divisors (see below), whose sum is σ = 171706080. Its totient is φ = 16352928.

The previous prime is 61323523. The next prime is 61323593. The reversal of 61323540 is 4532316.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 61323540.

It is a congruent number.

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, 510970 + ... + 511089.

It is an arithmetic number, because the mean of its divisors is an integer number (7154420).

Almost surely, 2^61323540 is an apocalyptic number.

61323540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61323540 is an abundant number, since it is smaller than the sum of its proper divisors (110382540).

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

61323540 is a wasteful number, since it uses less digits than its factorization.

61323540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022071 (or 1022069 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 61323540 is about 7830.9348100977. The cubic root of 61323540 is about 394.3444555714.

Adding to 61323540 its reverse (4532316), we get a palindrome (65855856).

The spelling of 61323540 in words is "sixty-one million, three hundred twenty-three thousand, five hundred forty".