80400749 has 24 divisors (see below), whose sum is σ = 96526080. Its totient is φ = 66512160.

The previous prime is 80400721. The next prime is 80400751. The reversal of 80400749 is 94700408.

It is a happy number.

It is not a de Polignac number, because 80400749 - 2⁸ = 80400493 is a prime.

It is a super-2 number, since 2×80400749² = 12928560879522002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80403749) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 123944 + ... + 124590.

It is an arithmetic number, because the mean of its divisors is an integer number (4021920).

Almost surely, 2^80400749 is an apocalyptic number.

It is an amenable number.

80400749 is a deficient number, since it is larger than the sum of its proper divisors (16125331).

80400749 is a wasteful number, since it uses less digits than its factorization.

80400749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761 (or 750 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 80400749 is about 8966.6464745745. The cubic root of 80400749 is about 431.6052295669.

The spelling of 80400749 in words is "eighty million, four hundred thousand, seven hundred forty-nine".