40997628 has 72 divisors (see below), whose sum is σ = 121666272. Its totient is φ = 11394432.

The previous prime is 40997609. The next prime is 40997653. The reversal of 40997628 is 82679904.

It is a happy number.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7126 + ... + 11522.

Almost surely, 2^40997628 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40997628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60833136).

40997628 is an abundant number, since it is smaller than the sum of its proper divisors (80668644).

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

40997628 is a wasteful number, since it uses less digits than its factorization.

40997628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4451 (or 4446 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 40997628 is about 6402.9390126722. The cubic root of 40997628 is about 344.8150741773.

The spelling of 40997628 in words is "forty million, nine hundred ninety-seven thousand, six hundred twenty-eight".