78153894 has 48 divisors (see below), whose sum is σ = 208414752. Its totient is φ = 20611584.

The previous prime is 78153893. The next prime is 78153923. The reversal of 78153894 is 49835187.

It is a super-2 number, since 2×78153894² = 12216062294726472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78153893) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22219 + ... + 25494.

It is an arithmetic number, because the mean of its divisors is an integer number (4341974).

Almost surely, 2^78153894 is an apocalyptic number.

78153894 is an abundant number, since it is smaller than the sum of its proper divisors (130260858).

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

78153894 is a wasteful number, since it uses less digits than its factorization.

78153894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47741 (or 47738 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 78153894 is about 8840.4691052002. The cubic root of 78153894 is about 427.5466820880.

The spelling of 78153894 in words is "seventy-eight million, one hundred fifty-three thousand, eight hundred ninety-four".