61501520 has 40 divisors (see below), whose sum is σ = 147609600. Its totient is φ = 23806080.

The previous prime is 61501519. The next prime is 61501543. The reversal of 61501520 is 2510516.

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 (20).

It is a junction number, because it is equal to n+sod(n) for n = 61501492 and 61501501.

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 7 ways as a sum of consecutive naturals, for example, 9920 + ... + 14879.

It is an arithmetic number, because the mean of its divisors is an integer number (3690240).

Almost surely, 2^61501520 is an apocalyptic number.

It is an amenable number.

61501520 is an abundant number, since it is smaller than the sum of its proper divisors (86108080).

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

61501520 is a wasteful number, since it uses less digits than its factorization.

61501520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24843 (or 24837 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 61501520 is about 7842.2904817407. The cubic root of 61501520 is about 394.7255905346.

The spelling of 61501520 in words is "sixty-one million, five hundred one thousand, five hundred twenty".