61673640 has 64 divisors (see below), whose sum is σ = 211455360. Its totient is φ = 14096640.

The previous prime is 61673629. The next prime is 61673659. The reversal of 61673640 is 4637616.

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 15 ways as a sum of consecutive naturals, for example, 35871 + ... + 37550.

It is an arithmetic number, because the mean of its divisors is an integer number (3303990).

Almost surely, 2^61673640 is an apocalyptic number.

61673640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61673640 is an abundant number, since it is smaller than the sum of its proper divisors (149781720).

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

61673640 is a wasteful number, since it uses less digits than its factorization.

61673640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73442 (or 73438 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 61673640 is about 7853.2566493143. The cubic root of 61673640 is about 395.0934778498.

The spelling of 61673640 in words is "sixty-one million, six hundred seventy-three thousand, six hundred forty".