61461660 has 48 divisors (see below), whose sum is σ = 185332896. Its totient is φ = 15128832.

The previous prime is 61461607. The next prime is 61461661. The reversal of 61461660 is 6616416.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61461661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38619 + ... + 40178.

It is an arithmetic number, because the mean of its divisors is an integer number (3861102).

Almost surely, 2^61461660 is an apocalyptic number.

61461660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61461660 is an abundant number, since it is smaller than the sum of its proper divisors (123871236).

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

61461660 is a wasteful number, since it uses less digits than its factorization.

61461660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78822 (or 78820 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 61461660 is about 7839.7487204629. The cubic root of 61461660 is about 394.6402963698.

The spelling of 61461660 in words is "sixty-one million, four hundred sixty-one thousand, six hundred sixty".