16720078 has 16 divisors (see below), whose sum is σ = 27275184. Its totient is φ = 7655040.

The previous prime is 16720073. The next prime is 16720097. The reversal of 16720078 is 87002761.

It is a happy number.

It is a super-2 number, since 2×16720078² = 559122016652168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16720073) 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, 5388 + ... + 7903.

It is an arithmetic number, because the mean of its divisors is an integer number (1704699).

Almost surely, 2^16720078 is an apocalyptic number.

16720078 is a deficient number, since it is larger than the sum of its proper divisors (10555106).

16720078 is a wasteful number, since it uses less digits than its factorization.

16720078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13347.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 16720078 is about 4089.0191978028. The cubic root of 16720078 is about 255.7090505586.

The spelling of 16720078 in words is "sixteen million, seven hundred twenty thousand, seventy-eight".