78154920 has 96 divisors (see below), whose sum is σ = 265075200. Its totient is φ = 19933056.

The previous prime is 78154919. The next prime is 78154931. The reversal of 78154920 is 2945187.

It is a super-2 number, since 2×78154920² = 12216383040412800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3561 + ... + 12999.

It is an arithmetic number, because the mean of its divisors is an integer number (2761200).

Almost surely, 2^78154920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78154920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132537600).

78154920 is an abundant number, since it is smaller than the sum of its proper divisors (186920280).

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

78154920 is a wasteful number, since it uses less digits than its factorization.

78154920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9479 (or 9472 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 78154920 is about 8840.5271336046. The cubic root of 78154920 is about 427.5485530162.

The spelling of 78154920 in words is "seventy-eight million, one hundred fifty-four thousand, nine hundred twenty".