61398615 has 16 divisors (see below), whose sum is σ = 102509568. Its totient is φ = 31322016.

The previous prime is 61398613. The next prime is 61398637. The reversal of 61398615 is 51689316.

It is not a de Polignac number, because 61398615 - 2¹ = 61398613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61398613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88639 + ... + 89328.

It is an arithmetic number, because the mean of its divisors is an integer number (6406848).

Almost surely, 2^61398615 is an apocalyptic number.

61398615 is a deficient number, since it is larger than the sum of its proper divisors (41110953).

61398615 is a wasteful number, since it uses less digits than its factorization.

61398615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177998.

The product of its digits is 38880, while the sum is 39.

The square root of 61398615 is about 7835.7268329109. The cubic root of 61398615 is about 394.5053146085.

The spelling of 61398615 in words is "sixty-one million, three hundred ninety-eight thousand, six hundred fifteen".