61139880 has 64 divisors (see below), whose sum is σ = 203803200. Its totient is φ = 16303680.

The previous prime is 61139879. The next prime is 61139887. The reversal of 61139880 is 8893116.

61139880 is a `hidden beast` number, since 611 + 39 + 8 + 8 + 0 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (61139887) 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, 27226 + ... + 29385.

It is an arithmetic number, because the mean of its divisors is an integer number (3184425).

Almost surely, 2^61139880 is an apocalyptic number.

61139880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61139880 is an abundant number, since it is smaller than the sum of its proper divisors (142663320).

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

61139880 is a wasteful number, since it uses less digits than its factorization.

61139880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56631 (or 56621 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 61139880 is about 7819.1994475138. The cubic root of 61139880 is about 393.9503832664.

The spelling of 61139880 in words is "sixty-one million, one hundred thirty-nine thousand, eight hundred eighty".