78142554 has 72 divisors (see below), whose sum is σ = 207361440. Its totient is φ = 21146832.

The previous prime is 78142553. The next prime is 78142577. The reversal of 78142554 is 45524187.

It is a super-2 number, since 2×78142554² = 12212517491285832, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78142553) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 14427 + ... + 19089.

It is an arithmetic number, because the mean of its divisors is an integer number (2880020).

Almost surely, 2^78142554 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78142554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103680720).

78142554 is an abundant number, since it is smaller than the sum of its proper divisors (129218886).

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

78142554 is a wasteful number, since it uses less digits than its factorization.

78142554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4704 (or 4694 counting only the distinct ones).

The product of its digits is 44800, while the sum is 36.

The square root of 78142554 is about 8839.8277132532. The cubic root of 78142554 is about 427.5260023170.

The spelling of 78142554 in words is "seventy-eight million, one hundred forty-two thousand, five hundred fifty-four".