80400945 has 16 divisors (see below), whose sum is σ = 128777472. Its totient is φ = 42835200.

The previous prime is 80400919. The next prime is 80400953. The reversal of 80400945 is 54900408.

It is not a de Polignac number, because 80400945 - 2¹⁵ = 80368177 is a prime.

It is a Curzon 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, 15784 + ... + 20246.

It is an arithmetic number, because the mean of its divisors is an integer number (8048592).

Almost surely, 2^80400945 is an apocalyptic number.

It is an amenable number.

80400945 is a deficient number, since it is larger than the sum of its proper divisors (48376527).

80400945 is a wasteful number, since it uses less digits than its factorization.

80400945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5672.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 80400945 is about 8966.6574039605. The cubic root of 80400945 is about 431.6055802874.

The spelling of 80400945 in words is "eighty million, four hundred thousand, nine hundred forty-five".