61100840 has 16 divisors (see below), whose sum is σ = 137476980. Its totient is φ = 24440320.

The previous prime is 61100821. The next prime is 61100861. The reversal of 61100840 is 4800116.

It can be written as a sum of positive squares in 2 ways, for example, as 58951684 + 2149156 = 7678^2 + 1466^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 763721 + ... + 763800.

Almost surely, 2^61100840 is an apocalyptic number.

It is an amenable number.

61100840 is an abundant number, since it is smaller than the sum of its proper divisors (76376140).

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

61100840 is a wasteful number, since it uses less digits than its factorization.

61100840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1527532 (or 1527528 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 61100840 is about 7816.7026296259. The cubic root of 61100840 is about 393.8665149433.

Adding to 61100840 its reverse (4800116), we get a palindrome (65900956).

The spelling of 61100840 in words is "sixty-one million, one hundred thousand, eight hundred forty".