61155680 has 48 divisors (see below), whose sum is σ = 152092080. Its totient is φ = 23173632.

The previous prime is 61155671. The next prime is 61155701. The reversal of 61155680 is 8655116.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

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, 7019 + ... + 13098.

It is an arithmetic number, because the mean of its divisors is an integer number (3168585).

Almost surely, 2^61155680 is an apocalyptic number.

It is an amenable number.

61155680 is an abundant number, since it is smaller than the sum of its proper divisors (90936400).

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

61155680 is a wasteful number, since it uses less digits than its factorization.

61155680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20151 (or 20143 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 61155680 is about 7820.2097158580. The cubic root of 61155680 is about 393.9843157284.

The spelling of 61155680 in words is "sixty-one million, one hundred fifty-five thousand, six hundred eighty".