72743890 has 16 divisors (see below), whose sum is σ = 135454680. Its totient is φ = 28094080.

The previous prime is 72743857. The next prime is 72743899. The reversal of 72743890 is 9834727.

It can be written as a sum of positive squares in 4 ways, for example, as 71757841 + 986049 = 8471^2 + 993^2 .

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (72743899) 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, 125131 + ... + 125710.

Almost surely, 2^72743890 is an apocalyptic number.

72743890 is a deficient number, since it is larger than the sum of its proper divisors (62710790).

72743890 is a wasteful number, since it uses less digits than its factorization.

72743890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250877.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 72743890 is about 8529.0028725520. The cubic root of 72743890 is about 417.4445932664. Note that the first 3 decimals are identical.

The spelling of 72743890 in words is "seventy-two million, seven hundred forty-three thousand, eight hundred ninety".