66779240 has 32 divisors (see below), whose sum is σ = 163913760. Its totient is φ = 24283200.

The previous prime is 66779173. The next prime is 66779261. The reversal of 66779240 is 4297766.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75446 + ... + 76325.

It is an arithmetic number, because the mean of its divisors is an integer number (5122305).

Almost surely, 2^66779240 is an apocalyptic number.

It is an amenable number.

66779240 is an abundant number, since it is smaller than the sum of its proper divisors (97134520).

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

66779240 is a wasteful number, since it uses less digits than its factorization.

66779240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151793 (or 151789 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 41.

The square root of 66779240 is about 8171.8565821972. The cubic root of 66779240 is about 405.7082359457.

The spelling of 66779240 in words is "sixty-six million, seven hundred seventy-nine thousand, two hundred forty".