61645080 has 64 divisors (see below), whose sum is σ = 211357440. Its totient is φ = 14090112.

The previous prime is 61645079. The next prime is 61645091. The reversal of 61645080 is 8054616.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

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, 35854 + ... + 37533.

It is an arithmetic number, because the mean of its divisors is an integer number (3302460).

Almost surely, 2^61645080 is an apocalyptic number.

61645080 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61645080 is an abundant number, since it is smaller than the sum of its proper divisors (149712360).

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

61645080 is a wasteful number, since it uses less digits than its factorization.

61645080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73408 (or 73404 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 61645080 is about 7851.4380848352. The cubic root of 61645080 is about 395.0324814394.

Adding to 61645080 its reverse (8054616), we get a palindrome (69699696).

The spelling of 61645080 in words is "sixty-one million, six hundred forty-five thousand, eighty".