78280250 has 32 divisors (see below), whose sum is σ = 147066192. Its totient is φ = 31200000.

The previous prime is 78280211. The next prime is 78280259. The reversal of 78280250 is 5208287.

It can be written as a sum of positive squares in 8 ways, for example, as 5058001 + 73222249 = 2249^2 + 8557^2 .

It is a super-2 number, since 2×78280250² = 12255595080125000, which contains 22 as substring.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (78280259) 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, 129950 + ... + 130550.

Almost surely, 2^78280250 is an apocalyptic number.

78280250 is a deficient number, since it is larger than the sum of its proper divisors (68785942).

78280250 is a wasteful number, since it uses less digits than its factorization.

78280250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139 (or 1129 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 78280250 is about 8847.6126723541. The cubic root of 78280250 is about 427.7769713196.

The spelling of 78280250 in words is "seventy-eight million, two hundred eighty thousand, two hundred fifty".