78487505 has 16 divisors (see below), whose sum is σ = 97818624. Its totient is φ = 60392640.

The previous prime is 78487481. The next prime is 78487511. The reversal of 78487505 is 50578487.

It is not a de Polignac number, because 78487505 - 2¹² = 78483409 is a prime.

It is a super-2 number, since 2×78487505² = 12320576882250050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25352 + ... + 28278.

It is an arithmetic number, because the mean of its divisors is an integer number (6113664).

Almost surely, 2^78487505 is an apocalyptic number.

It is an amenable number.

78487505 is a deficient number, since it is larger than the sum of its proper divisors (19331119).

78487505 is a wasteful number, since it uses less digits than its factorization.

78487505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3136.

The product of its (nonzero) digits is 313600, while the sum is 44.

The square root of 78487505 is about 8859.3174116294. The cubic root of 78487505 is about 428.1541664467.

The spelling of 78487505 in words is "seventy-eight million, four hundred eighty-seven thousand, five hundred five".