61387537 has 8 divisors (see below), whose sum is σ = 66195360. Its totient is φ = 56737440.

The previous prime is 61387507. The next prime is 61387549. The reversal of 61387537 is 73578316.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61387537 - 2¹⁹ = 60863249 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61387537.

It is not an unprimeable number, because it can be changed into a prime (61387507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38623 + ... + 40180.

It is an arithmetic number, because the mean of its divisors is an integer number (8274420).

Almost surely, 2^61387537 is an apocalyptic number.

It is an amenable number.

61387537 is a deficient number, since it is larger than the sum of its proper divisors (4807823).

61387537 is a wasteful number, since it uses less digits than its factorization.

61387537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78863.

The product of its digits is 105840, while the sum is 40.

The square root of 61387537 is about 7835.0199106320. The cubic root of 61387537 is about 394.4815866426.

The spelling of 61387537 in words is "sixty-one million, three hundred eighty-seven thousand, five hundred thirty-seven".