78243090 has 16 divisors (see below), whose sum is σ = 187783488. Its totient is φ = 20864816.

The previous prime is 78243089. The next prime is 78243119. The reversal of 78243090 is 9034287.

It is a super-2 number, since 2×78243090² = 12243962265496200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1304022 + ... + 1304081.

It is an arithmetic number, because the mean of its divisors is an integer number (11736468).

Almost surely, 2^78243090 is an apocalyptic number.

78243090 is an abundant number, since it is smaller than the sum of its proper divisors (109540398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78243090 is a wasteful number, since it uses less digits than its factorization.

78243090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2608113.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 78243090 is about 8845.5124215616. The cubic root of 78243090 is about 427.7092713644.

The spelling of 78243090 in words is "seventy-eight million, two hundred forty-three thousand, ninety".