40778465 has 64 divisors (see below), whose sum is σ = 65318400. Its totient is φ = 23721984.

The previous prime is 40778459. The next prime is 40778467. The reversal of 40778465 is 56487704.

It is not a de Polignac number, because 40778465 - 2⁶ = 40778401 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40778467) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 458141 + ... + 458229.

It is an arithmetic number, because the mean of its divisors is an integer number (1020600).

Almost surely, 2^40778465 is an apocalyptic number.

It is an amenable number.

40778465 is a deficient number, since it is larger than the sum of its proper divisors (24539935).

40778465 is a wasteful number, since it uses less digits than its factorization.

40778465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186.

The product of its (nonzero) digits is 188160, while the sum is 41.

The square root of 40778465 is about 6385.8018290580. The cubic root of 40778465 is about 344.1995445169.

The spelling of 40778465 in words is "forty million, seven hundred seventy-eight thousand, four hundred sixty-five".