78490542 has 32 divisors (see below), whose sum is σ = 173632032. Its totient is φ = 23497344.

The previous prime is 78490541. The next prime is 78490553. The reversal of 78490542 is 24509487.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 78490542.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78490541) 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, 10713 + ... + 16484.

It is an arithmetic number, because the mean of its divisors is an integer number (5426001).

Almost surely, 2^78490542 is an apocalyptic number.

78490542 is an abundant number, since it is smaller than the sum of its proper divisors (95141490).

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

78490542 is a wasteful number, since it uses less digits than its factorization.

78490542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27252.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 78490542 is about 8859.4888114383. The cubic root of 78490542 is about 428.1596887161.

The spelling of 78490542 in words is "seventy-eight million, four hundred ninety thousand, five hundred forty-two".