15978061 has 8 divisors (see below), whose sum is σ = 17466624. Its totient is φ = 14495520.

The previous prime is 15978041. The next prime is 15978097. The reversal of 15978061 is 16087951.

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

It is a cyclic number.

It is not a de Polignac number, because 15978061 - 2⁷ = 15977933 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 15978061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15978041) 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, 5481 + ... + 7873.

It is an arithmetic number, because the mean of its divisors is an integer number (2183328).

Almost surely, 2^15978061 is an apocalyptic number.

15978061 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

15978061 is a deficient number, since it is larger than the sum of its proper divisors (1488563).

15978061 is a wasteful number, since it uses less digits than its factorization.

15978061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3011.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 15978061 is about 3997.2566842774. The cubic root of 15978061 is about 251.8689847648.

The spelling of 15978061 in words is "fifteen million, nine hundred seventy-eight thousand, sixty-one".