61428015 has 24 divisors (see below), whose sum is σ = 116155728. Its totient is φ = 29783040.

The previous prime is 61427999. The next prime is 61428047. The reversal of 61428015 is 51082416.

It is not a de Polignac number, because 61428015 - 2⁴ = 61427999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61428015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61554 + ... + 62543.

It is an arithmetic number, because the mean of its divisors is an integer number (4839822).

Almost surely, 2^61428015 is an apocalyptic number.

61428015 is a deficient number, since it is larger than the sum of its proper divisors (54727713).

61428015 is a wasteful number, since it uses less digits than its factorization.

61428015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124119 (or 124116 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 61428015 is about 7837.6026309070. The cubic root of 61428015 is about 394.5682726274.

The spelling of 61428015 in words is "sixty-one million, four hundred twenty-eight thousand, fifteen".