61651980 has 72 divisors (see below), whose sum is σ = 201404112. Its totient is φ = 15175296.

The previous prime is 61651951. The next prime is 61652083. The reversal of 61651980 is 8915616.

61651980 is a `hidden beast` number, since 61 + 6 + 519 + 80 = 666.

61651980 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10834 + ... + 15513.

Almost surely, 2^61651980 is an apocalyptic number.

61651980 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61651980 is an abundant number, since it is smaller than the sum of its proper divisors (139752132).

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

61651980 is a wasteful number, since it uses less digits than its factorization.

61651980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26375 (or 26370 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 61651980 is about 7851.8774824879. The cubic root of 61651980 is about 395.0472196928.

The spelling of 61651980 in words is "sixty-one million, six hundred fifty-one thousand, nine hundred eighty".