61541520 has 40 divisors (see below), whose sum is σ = 190779456. Its totient is φ = 16411008.

The previous prime is 61541483. The next prime is 61541521. The reversal of 61541520 is 2514516.

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 (24).

It is not an unprimeable number, because it can be changed into a prime (61541521) by changing a digit.

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, 127972 + ... + 128451.

Almost surely, 2^61541520 is an apocalyptic number.

61541520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61541520 is an abundant number, since it is smaller than the sum of its proper divisors (129237936).

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

61541520 is a wasteful number, since it uses less digits than its factorization.

61541520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256439 (or 256433 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 61541520 is about 7844.8403425436. The cubic root of 61541520 is about 394.8111472377.

The spelling of 61541520 in words is "sixty-one million, five hundred forty-one thousand, five hundred twenty".