78417542 has 24 divisors (see below), whose sum is σ = 137552400. Its totient is φ = 33430320.

The previous prime is 78417529. The next prime is 78417553. The reversal of 78417542 is 24571487.

It is a super-2 number, since 2×78417542² = 12298621786643528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78417496 and 78417505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17492 + ... + 21512.

It is an arithmetic number, because the mean of its divisors is an integer number (5731350).

Almost surely, 2^78417542 is an apocalyptic number.

78417542 is a deficient number, since it is larger than the sum of its proper divisors (59134858).

78417542 is a wasteful number, since it uses less digits than its factorization.

78417542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4236 (or 4229 counting only the distinct ones).

The product of its digits is 62720, while the sum is 38.

The square root of 78417542 is about 8855.3679765439. The cubic root of 78417542 is about 428.0269111387.

The spelling of 78417542 in words is "seventy-eight million, four hundred seventeen thousand, five hundred forty-two".