78385090 has 32 divisors (see below), whose sum is σ = 162860544. Its totient is φ = 26606400.

The previous prime is 78385033. The next prime is 78385093. The reversal of 78385090 is 9058387.

It is a super-2 number, since 2×78385090² = 12288444668616200, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (78385093) 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, 1527 + ... + 12613.

It is an arithmetic number, because the mean of its divisors is an integer number (5089392).

Almost surely, 2^78385090 is an apocalyptic number.

78385090 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

78385090 is an abundant number, since it is smaller than the sum of its proper divisors (84475454).

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

78385090 is a wasteful number, since it uses less digits than its factorization.

78385090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11202.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 78385090 is about 8853.5354520101. The cubic root of 78385090 is about 427.9678586805.

The spelling of 78385090 in words is "seventy-eight million, three hundred eighty-five thousand, ninety".