78213372 has 48 divisors (see below), whose sum is σ = 191987712. Its totient is φ = 24747840.

The previous prime is 78213371. The next prime is 78213389. The reversal of 78213372 is 27331287.

It is a super-2 number, since 2×78213372² = 12234663119220768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78213371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17733 + ... + 21699.

It is an arithmetic number, because the mean of its divisors is an integer number (3999744).

Almost surely, 2^78213372 is an apocalyptic number.

It is an amenable number.

78213372 is an abundant number, since it is smaller than the sum of its proper divisors (113774340).

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

78213372 is a wasteful number, since it uses less digits than its factorization.

78213372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4058 (or 4056 counting only the distinct ones).

The product of its digits is 14112, while the sum is 33.

The square root of 78213372 is about 8843.8324271777. The cubic root of 78213372 is about 427.6551141913.

It can be divided in two parts, 78213 and 372, that multiplied together give a square (29095236 = 5394²).

The spelling of 78213372 in words is "seventy-eight million, two hundred thirteen thousand, three hundred seventy-two".