78267690 has 48 divisors (see below), whose sum is σ = 207836928. Its totient is φ = 20426208.

The previous prime is 78267667. The next prime is 78267701. The reversal of 78267690 is 9676287.

It is a happy number.

It is a super-2 number, since 2×78267690² = 12251662595872200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5022 + ... + 13481.

It is an arithmetic number, because the mean of its divisors is an integer number (4329936).

Almost surely, 2^78267690 is an apocalyptic number.

78267690 is an abundant number, since it is smaller than the sum of its proper divisors (129569238).

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

78267690 is a wasteful number, since it uses less digits than its factorization.

78267690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18563 (or 18560 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 78267690 is about 8846.9028478898. The cubic root of 78267690 is about 427.7540912779.

The spelling of 78267690 in words is "seventy-eight million, two hundred sixty-seven thousand, six hundred ninety".