78270090 has 32 divisors (see below), whose sum is σ = 188386560. Its totient is φ = 20812224.

The previous prime is 78270067. The next prime is 78270097. The reversal of 78270090 is 9007287.

It is a super-2 number, since 2×78270090² = 12252413977216200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78270097) 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, 7456 + ... + 14564.

It is an arithmetic number, because the mean of its divisors is an integer number (5887080).

Almost surely, 2^78270090 is an apocalyptic number.

78270090 is an abundant number, since it is smaller than the sum of its proper divisors (110116470).

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

78270090 is a wasteful number, since it uses less digits than its factorization.

78270090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7486.

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 78270090 is about 8847.0384875392. The cubic root of 78270090 is about 427.7584634496.

The spelling of 78270090 in words is "seventy-eight million, two hundred seventy thousand, ninety".