61601640 has 32 divisors (see below), whose sum is σ = 184805280. Its totient is φ = 16427072.

The previous prime is 61601621. The next prime is 61601711. The reversal of 61601640 is 4610616.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 61601640.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256554 + ... + 256793.

It is an arithmetic number, because the mean of its divisors is an integer number (5775165).

Almost surely, 2^61601640 is an apocalyptic number.

61601640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61601640 is an abundant number, since it is smaller than the sum of its proper divisors (123203640).

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

61601640 is a wasteful number, since it uses less digits than its factorization.

61601640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513361 (or 513357 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 61601640 is about 7848.6712251183. The cubic root of 61601640 is about 394.9396692561.

The spelling of 61601640 in words is "sixty-one million, six hundred one thousand, six hundred forty".