61887533 has 4 divisors (see below), whose sum is σ = 62042268. Its totient is φ = 61732800.

The previous prime is 61887523. The next prime is 61887547. The reversal of 61887533 is 33578816.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55547209 + 6340324 = 7453^2 + 2518^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61887533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61887523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76766 + ... + 77567.

It is an arithmetic number, because the mean of its divisors is an integer number (15510567).

Almost surely, 2^61887533 is an apocalyptic number.

It is an amenable number.

61887533 is a deficient number, since it is larger than the sum of its proper divisors (154735).

61887533 is a wasteful number, since it uses less digits than its factorization.

61887533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154734.

The product of its digits is 120960, while the sum is 41.

The square root of 61887533 is about 7866.8629707146. The cubic root of 61887533 is about 395.5496977307.

The spelling of 61887533 in words is "sixty-one million, eight hundred eighty-seven thousand, five hundred thirty-three".