78126890 has 8 divisors (see below), whose sum is σ = 140628420. Its totient is φ = 31250752.

The previous prime is 78126889. The next prime is 78126901. The reversal of 78126890 is 9862187.

It can be written as a sum of positive squares in 2 ways, for example, as 74114881 + 4012009 = 8609^2 + 2003^2 .

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

It is a super-2 number, since 2×78126890² = 12207621882144200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3906335 + ... + 3906354.

Almost surely, 2^78126890 is an apocalyptic number.

78126890 is a deficient number, since it is larger than the sum of its proper divisors (62501530).

78126890 is a wasteful number, since it uses less digits than its factorization.

78126890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7812696.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 78126890 is about 8838.9416787305. The cubic root of 78126890 is about 427.4974339529.

The spelling of 78126890 in words is "seventy-eight million, one hundred twenty-six thousand, eight hundred ninety".