61812740 has 24 divisors (see below), whose sum is σ = 141607872. Its totient is φ = 22477280.

The previous prime is 61812739. The next prime is 61812749. The reversal of 61812740 is 4721816.

It is not an unprimeable number, because it can be changed into a prime (61812749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140264 + ... + 140703.

It is an arithmetic number, because the mean of its divisors is an integer number (5900328).

Almost surely, 2^61812740 is an apocalyptic number.

It is an amenable number.

61812740 is an abundant number, since it is smaller than the sum of its proper divisors (79795132).

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

61812740 is a wasteful number, since it uses less digits than its factorization.

61812740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280987 (or 280985 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 61812740 is about 7862.1078598554. The cubic root of 61812740 is about 395.3902888106.

The spelling of 61812740 in words is "sixty-one million, eight hundred twelve thousand, seven hundred forty".