61086920 has 16 divisors (see below), whose sum is σ = 137445660. Its totient is φ = 24434752.

The previous prime is 61086917. The next prime is 61086937. The reversal of 61086920 is 2968016.

It can be written as a sum of positive squares in 2 ways, for example, as 60621796 + 465124 = 7786^2 + 682^2 .

It is a super-2 number, since 2×61086920² = 7463223590172800, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 763547 + ... + 763626.

Almost surely, 2^61086920 is an apocalyptic number.

It is an amenable number.

61086920 is an abundant number, since it is smaller than the sum of its proper divisors (76358740).

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

61086920 is a wasteful number, since it uses less digits than its factorization.

61086920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1527184 (or 1527180 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 61086920 is about 7815.8121778866. The cubic root of 61086920 is about 393.8366024342.

The spelling of 61086920 in words is "sixty-one million, eighty-six thousand, nine hundred twenty".