78154066 has 16 divisors (see below), whose sum is σ = 124761600. Its totient is φ = 36590400.

The previous prime is 78154061. The next prime is 78154067. The reversal of 78154066 is 66045187.

It is a super-2 number, since 2×78154066² = 12216116064664712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78154061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 991 + ... + 12541.

It is an arithmetic number, because the mean of its divisors is an integer number (7797600).

Almost surely, 2^78154066 is an apocalyptic number.

78154066 is a deficient number, since it is larger than the sum of its proper divisors (46607534).

78154066 is a wasteful number, since it uses less digits than its factorization.

78154066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11769.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 78154066 is about 8840.4788331855. The cubic root of 78154066 is about 427.5469957341.

It can be divided in two parts, 7815 and 4066, that added together give a square (11881 = 109²).

The spelling of 78154066 in words is "seventy-eight million, one hundred fifty-four thousand, sixty-six".