61868840 has 32 divisors (see below), whose sum is σ = 151860960. Its totient is φ = 22497600.

The previous prime is 61868837. The next prime is 61868843. The reversal of 61868840 is 4886816.

It is an interprime number because it is at equal distance from previous prime (61868837) and next prime (61868843).

It is not an unprimeable number, because it can be changed into a prime (61868843) 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, 69866 + ... + 70745.

It is an arithmetic number, because the mean of its divisors is an integer number (4745655).

Almost surely, 2^61868840 is an apocalyptic number.

It is an amenable number.

61868840 is an abundant number, since it is smaller than the sum of its proper divisors (89992120).

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

61868840 is a wasteful number, since it uses less digits than its factorization.

61868840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140633 (or 140629 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 41.

The square root of 61868840 is about 7865.6747962270. The cubic root of 61868840 is about 395.5098687338.

The spelling of 61868840 in words is "sixty-one million, eight hundred sixty-eight thousand, eight hundred forty".