61881580 has 24 divisors (see below), whose sum is σ = 134144640. Its totient is φ = 23953920.

The previous prime is 61881577. The next prime is 61881583. The reversal of 61881580 is 8518816.

It is an interprime number because it is at equal distance from previous prime (61881577) and next prime (61881583).

It is not an unprimeable number, because it can be changed into a prime (61881583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49285 + ... + 50524.

It is an arithmetic number, because the mean of its divisors is an integer number (5589360).

Almost surely, 2^61881580 is an apocalyptic number.

It is an amenable number.

61881580 is an abundant number, since it is smaller than the sum of its proper divisors (72263060).

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

61881580 is a wasteful number, since it uses less digits than its factorization.

61881580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99849 (or 99847 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 37.

The square root of 61881580 is about 7866.4846024129. The cubic root of 61881580 is about 395.5370146008.

The spelling of 61881580 in words is "sixty-one million, eight hundred eighty-one thousand, five hundred eighty".