61245840 has 40 divisors (see below), whose sum is σ = 189862848. Its totient is φ = 16332160.

The previous prime is 61245829. The next prime is 61245859. The reversal of 61245840 is 4854216.

It is a tau number, because it is divible by the number of its divisors (40).

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

It is a junction number, because it is equal to n+sod(n) for n = 61245798 and 61245807.

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 7 ways as a sum of consecutive naturals, for example, 127356 + ... + 127835.

Almost surely, 2^61245840 is an apocalyptic number.

61245840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61245840 is an abundant number, since it is smaller than the sum of its proper divisors (128617008).

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

61245840 is a wasteful number, since it uses less digits than its factorization.

61245840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255207 (or 255201 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 61245840 is about 7825.9721440854. The cubic root of 61245840 is about 394.1778337795.

The spelling of 61245840 in words is "sixty-one million, two hundred forty-five thousand, eight hundred forty".