78200728 has 8 divisors (see below), whose sum is σ = 146626380. Its totient is φ = 39100360.

The previous prime is 78200687. The next prime is 78200737. The reversal of 78200728 is 82700287.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×78200728² = 12230707719459968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78200693 and 78200702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4887538 + ... + 4887553.

Almost surely, 2^78200728 is an apocalyptic number.

It is an amenable number.

78200728 is a deficient number, since it is larger than the sum of its proper divisors (68425652).

78200728 is a wasteful number, since it uses less digits than its factorization.

78200728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9775097 (or 9775093 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 34.

The square root of 78200728 is about 8843.1175498237. The cubic root of 78200728 is about 427.6320679929.

The spelling of 78200728 in words is "seventy-eight million, two hundred thousand, seven hundred twenty-eight".